重要提示：请勿将账号共享给其他人使用，违者账号将被封禁！
查看《购买须知》>>>
首页 > 外语类考试> 职称英语
网友您好，请在下方输入框内输入要搜索的题目：
搜题
拍照、语音搜题，请扫码下载APP
扫一扫 下载APP
题目内容 （请给出正确答案）
[主观题]

First Planet from the SunMercury, the planet nearest the sun, is difficult to observe from

First Planet from the Sun

Mercury, the planet nearest the sun, is difficult to observe from the Earth because it rises and sets within two hours of the sun. ______【46】

Planetary scientists can estimates the age of a planet's surface by the number of impact craters on it. In general, the older the surface, the more craters it has. ______【47】. Between these regions are areas of gently rolling plains that may have been smoothed by volcanic lava flows or by accumulated deposits of fine material ejected during impacts. These plains are also old enough to have accumulated a large number of impact craters. Elsewhere on the planet are smooth, flat plains that are probably younger and volcanic in origin. ______【48】. Sometime between the formation of the intercrater plains and the formation of the smooth plains, the whole planet may have shrunk as it cooled, causing the crust to buckle and form. the long, steep cliffs called scarps.

The largest impact basin on Mercury has a diameter of about 800 miles (1, 300 kilometers) and is surrounded by mountains that rise to heights of about 1. 2 miles (2 kilometers). ______【49】.

On the opposite side of the planet is an area of hilly, linear terrain that probably resulted from seismic waves caused by the same impact.

Like other airless, solid bodies in the solar system, the entire surface of Mercury is covered with a layer of rubble called regolith, which is composed of material, ranging from dust to boulders, that was scattered when impact craters were formed. This debris was in turn broken up and redistributed by subsequent impacts.

Mercury is very dense and has a magnetic field that is about 1 percent as strong as earth's. This suggests the existence of a planetary core composed of iron and nickel and constituting about 40 percent of the planet's volume. ______【50】. Radar images taken of Mercury in 1991 show what are considered to be large ice patches at the planet's North Pole.

A. Some regions on Mercury are heavily cratered, suggesting that they are very old surfaces that were probably formed about 4 billion years ago

B. The crater was probably created by the impact of a large planetesimal when Mercury was forming

C. Consequently, little was known about the planet until the Mariner 10 spacecraft made several flybys in 1974 and 1975

D. Mercury is much smaller than the Earth

E. The surface gravity is about one-third as strong as Earth's, and a thin atmosphere surrounds the planet

F. These plains have relatively few impact craters

(46)

答案
查看答案
发布时间：2021-04-19
收藏
更多“First Planet from the SunMercury, the planet nearest the sun, is difficult to observe from”相关的问题

第1题

When Geoff Marcy was 14, his parents bought him a telescope. Every night, he would go onto
the roof outside his window to see the wonders of the sky.

"What excited me most was whether there were planets (行星)in other solar (太阳的) systems where life might exist," he says. "I decided to try to find planets orbiting (沿......轨道运行) other stars like our Sun."

And he did. "My fellow researcher, Paul Butler, and I found our first planet in 1995," Dr. Marcy says. "We worked for ten years without finding anything! But we stuck with it, and our patience paid off."

Since then, the two scientists have discovered 65 of the more than 100 planets found orbiting other stars. Dr. Marcy and Dr. Butler also spotted the first "family" of three planets. In June 2002 they announced another discovery: a Jupiter-like (像木星一样的) planet orbiting star 55 Caned. At first, the two researchers found only planets that orbit close to stars. Recently, the scientists found planets farther out. The planet orbiting 55 Cancri is a major breakthrough: it is the first sighting of a large gas planet about the same distance from the star as Jupiter is from the Sun. Why is this important？ Scientists think that life on Earth may exist because of two special features (征) in our solar system. The first is Jupiter.

"Because it's so big, Jupiter pulls comets and asteroids (小行星), or they all come and hit the Earth." Dr. Marcy explains. "Without Jupiter, life on Earth would likely have been destroyed." A second feature is that Earth is a rocky planet where liquid water, which is necessary for life, can exist. Unlike gas planets, rocky planets like Earth have surfaces where water can gather in pools and seas, which may support life. A huge space exists between the Jupiter-like planet and two other planets that lie close to 55 Caneri. Is there an Earth-like planet in the space, too small for us to notice？ If so, says Dr. Marcy, "We would have two striking similarities to our solar system: a Jupiter-like planet and an Earth-like planet. And there may be life!"

What can we learn about Dr. Marcy from the passage？

A．He is fond of watching Jupiter.

B．He is from a scientist family.

C．He dislikes working with Paul Butler.

D．He is interested in finding life in outer space.

点击查看答案

第2题

What do you know about Afghanistan from the first paragraph？A．Terrorists have destroyed th

What do you know about Afghanistan from the first paragraph？

A．Terrorists have destroyed the forests in Afghanistan.

B．Afghanistan has suffered from the natural and man-made disasters.

C．Soma refugees hunt snow leopards to gain profits in the border business.

D．There has been a large area of forests in Afghanistan before.

点击查看答案

第3题

It can be inferred from the passage that______.A．all the European countries fall behind th

It can be inferred from the passage that______.

A．all the European countries fall behind the average as far as the women on boards are concerned

B．the more females in the boardroom, the better the corporation"s performance will be

C．females" first choice of their career may exert far-lasting influences on their future development

D．meritocracy in the corporation is the root that causes low female representation

点击查看答案

第4题

What can we infer from the tragic example given in the first paragraph？A．People rescued th

What can we infer from the tragic example given in the first paragraph？

A．People rescued the man before he was drowned in the polluted water.

B．Some people were near the man who was drowning but they did not try to rescue him.

C．The man could have been saved if the Thames had not been so seriously polluted.

D．The rescuers could not see the drowned man because he was carried away by the fast flowing river water.

点击查看答案

第5题

1：Reading Comprehension（子母填空): Answer Questions 1～10 by referring to the comments on

1：Reading Comprehension(子母填空): Answer Questions 1～10 by referring to the comments on 3 different planets in the following magazine article. Note: Answer each question by choosing A, B or C and mark it on ANSWER SHEET 1. Some choices may be required more than once. A = Saturn B = Venus C = Mercury Which planet(s)... Saturn For beauty and interest alike, there are few objects in the starry heavens to compare with Saturn. This magnificent planet, with the system of rings that encircles it, provides an unforgettable spectacle when it is viewed through a powerful telescope. The Saturnian system includes not only the planet and its rings, but also 11 or more satellites, or moons. To the ancients Saturn appeared to be the most insignificant of the heavenly bodies that were supposed to circle the Earth (the Sun, the Moon, Mercury, Venus, Mars, Jupiter, and Saturn), as distinguished from the fixed stars. The glorious rings that surround the planet were invisible before the invention of the telescope in the first decade of the seventeenth century. Otherwise this magnificent crown might have saved Saturn from the sinister reputation that it once bore. Ancient astrologers maintained that it had a sinister influence upon people. Saturn is far from the center of the solar system. The mean distance of Saturn from the sun is 1,428,000,000 kilometers, or about 9.5 times the distance of the earth from the sun. The density of Saturn is very low, much lower than that of any other planet. In fact it is only about three-quarters that of water. Because of this fact some astronomers hold that Saturn is far from having reached the solid condition. Venus The beautiful white planet whose orbit lies between those of Mercury and of the Earth is called Venus after the Roman goddess of beauty. The planet is similar to our earth in size and mass. Its diameter is about 12,100 kilometers; the earth's is 12,725 kilometers. Its mass is a little more than four-fifths that of the earth. Its density is about nine-tenths that of our planet. Venus revolves around the sun once every 225 days in an orbit that is very nearly circular. As the planet revolves, it rotates about its axis once every 243.1 earth days, from east to west instead of in the west-to-east direction of most other celestial bodies. The planet is tilted only slightly with respect to the plane of its orbit. As it proceeds along its orbit, Venus is sometimes on the far side of the sun from the earth, or at superior conjunction. At other times Venus is between the sun and the earth, at inferior conjunction. At superior conjunction it is quite far from earth. But at inferior conjunction it is only about 41,840,000 kilometers away-closer than any other planet. These variations in distance result in notable differences in the apparent size of the planet as viewed from the earth, at inferior conjunction, the apparent diameter is six times greater than at superior conjunction. Venus has been explored by 15 spacecraft of which five were from the United States and ten were from the soviet Union. Some of these were orbiters, some were landers, and some were both. The planet is completely covered with opaque clouds, which make an almost perfect reflecting layer. Mercury Mercury is the nearest of the planets to the sun. It is the smallest of all and also, at certain intervals, one of the brightest. In spite of that fact, it is generally not easy to see with the naked eye. For one thing, it appears in the heavens only during the hours of twilight and dawn, when even very bright stars do not appear at their best. Besides, it is often obscured by haze near the horizon. The great Polish astronomer Nicholas Copernicus once lamented the fact that he had not been able to see Mercury at all in his many years of observation of the heavens. Perhaps this was due to the nature of the district where he lived—the low and misty region of eastern Prussia where the Vistula flows into the Baltic. Mercury makes such a small circuit around the Sun that it is always comparatively near that body. It never rises in the morning or sets in the evening much before or after the Sun. Because of its appearance sometimes in the east and sometimes in the west, some ancient peoples including the Egyptians, Hindus, and Greeks, thought of it as two separate heavenly bodies—a morning star and an evening star. The Greeks called the morning star "Apollon" after the god of the sun, and the evening star "Hermes", the name of the swift messenger of the gods, because the planet's apparent motion among the stars was so swift. It is said that the Greek philosopher Pythagoras, who lived in the sixth century B. C. , was the first to recognize that the morning star and evening star were one and the same heavenly body. That fact was well known to Roman astronomers. Hermes was worshiped by the Romans under the name of Mercury. Scientists were surprised to discover that Mercury has a very thin atmosphere consisting of helium. It is so thin that the word "atmosphere" gives the wrong impression, but no such gas envelope has been expected at all. Another surprise was that Mercury has a weak magnetic field. Whether this field is produced by the planet itself or produced in some way by the solar wind— the stream of particles flowing out from the Sun—is not yet certain. But at any rate, the interior of Mercury is probably earth like in composition, with an iron core and a less dense outer crust. 1：has been explored by 15 spacecraft？ 1.______

点击查看答案

第6题

Which of the following statements is INCORRECT？A．The planet must be as big and heavy as th

Which of the following statements is INCORRECT？

A．The planet must be as big and heavy as the earth.

B．Proper conditions are essential to the existence of life.

C．Double stars can provide steady light and heat.

D．The distance between a planet and its sun should be right.

点击查看答案

第7题

Astronomers have discovered what may be five planets orbiting Tau Ceti, the closest singl
e star beyond our solar system whose temperature and luminosity nearly matches the suns. If the 【M1】______ planets are there, one of them is about the right distance from the star to support mild temperatures, oceans of liquid water, and even life. Tau Ceti is only 12 light-years from Earth, just three times as far as our suns nearest stellar neighbor, Alpha Centauri. Tau Ceti assembles the sun so much that astronomer Frank Drake, who has 【M2】______ long sought radio signals from possible extraterrestrial civilizations, made it his first target back in 1960. Unlike most stars, that are 【M3】______ faint, cool, and small, Tau Ceti is a bright G-type yellow main-sequence star like the sun, a trait that only one in 25 stars boasts of. Moreover, unlike Alpha Centauri, which also harbors a 【M4】______ G-type star and even a planet, Tau Ceti is single, therefore theres 【M5】______ no second star in the system whose gravity could yank planets away. Astronomer Mikko Tuomi of the University of Hertfordshire in the United Kingdom and his colleagues analyzed more than 6,000 observations of Tau Ceti from telescopes in Chile, Australia, and Hawaii. As the researchers will report in Astronomy & Astrophysics, slight changes in Tau Cetis motion through space suggest that the star may be responding to gravitational tugs from five planets that are only about two to seven times as massive as Earth. If thats right, all five planets lie close to their star than Mars 【M6】______ does ours; however, Tau Ceti emits only 45% as much light as the 【M7】______ sun, so each planet receives less warmth than a planet would at the same distance from our sun. Tau Cetis three innermost planets — designated b, c, and d — are probably too hot to support life, being such close to the star that they require only 14, 35, and 【M8】______ 94 days to complete an orbit. The farthest of the three, d, is about as close to Tau Ceti as Mercury is to the sun. Its fourth 【M9】______ planet — planet e — that the scientists suggest might be another life-bearing world, even though its about four times as massive as Earth. If you live there, youd see a yellow sun in the sky, but your 【M10】______ year would last just 168 days.

【M1】

点击查看答案

第8题

Part Ⅱ Reading Comprehension （Skimming and Scanning)Directions: In this part you will have

Part Ⅱ Reading Comprehension (Skimming and Scanning)

Directions: In this part you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A), B), C) and D). For questions 8-10, complete the sentences with the information given in the passage.

Sustainable Communities

According to the World Wildlife Fund, people are currently using resources 25 percent faster than they can be replaced. If we continue down this course, we will need a second planet by the year 2050. Sustainable communities attempt to change that course by drastically altering how citizens interact with the environment.

Alternatively known as green communities or ecovillages (生态村), sustainable communities vary in their approaches to sustainable living, or a way of life that meets the population's basic needs in ways that can be continued indefinitely for future generations. Some communities focus solely on enriching the environment, while others also aim to improve social and economic conditions as well.

Characteristics of Sustainable Living Communities

Sustainable communities generally strive to minimize waste, reduce consumption and preserve open space. Ideally, they don't use resources faster than they can be replenished, and they don't produce waste faster than it can be assimilated back into the environment. Granted, some communities are more radical than others--living entirely off the grid and eschewing the use of government:--printed money--but the basic principles are similar.

Designing the neighborhood to encourage walking or bicycling is one way sustainable communities put these first two principles into practice. Less driving means less gas and emissions. Many ecovillages also incorporate work space into homes or encourage telecommuting. They also might zone part of the development for commercial use, essentially making the community a serf-contained environment where residents don't even have to leave for shopping or entertainment. This design sometimes is called a live- work-play lifestyle.

Using green building techniques is another staple of sustainable communities. Here are a few examples:

- Architects design buildings to take advantage of the sun's lighting and heating capabilities.

- They install energy-efficient appliances.

- They try to use local sources of materials as much as possible to cut back on the environmental costs of transport.

- They build with durable, non-toxic materials that have either been recycled or sustainably harvested.

You might see straw bale (草捆) houses, which essentially use bales of straw as the structural building blocks; cob houses, which are a mix of straw, clay and sand or earthbag homes, which are exactly what they sound like, homes made out of bags of dirt.

Along with green building techniques, sustainable communities rely on green gardening methods. They landscape with native, drought-tolerant plants and raise them organically to reduce water and keep pesticides and herbicides out of the environment.

Many communities also set aside a significant portion of their land as open space. Serenbe, for example, reserves 80 percent of its 900 acres for green space, that is, 720 acres of rolling hills, woods and streams free of development, quite a contrast to the concrete-laden urban sprawl of Atlanta just 32 miles away.

Another way sustainable communities reduce their ecological footprint is by capturing and recycling their wastes, often creating their own contained natural cycles. Instead of treating normally perceived waste products such as rainwater and sewage as pollution to be gotten rid of, residents mm th

A．We can have another planet called the Earth.

B．We will use up resources on Earth.

C．We will work out replaceable resources.

D．We will migrate to another planet to live.

点击查看答案

第9题

As early as kindergarten we&39; re taught that there are nine planets, but 200 years a
go, even scholars were sure there were only six planets.

2. As recently as the 1700s, people still believed that the planet Saturn was at the farthest extent of the solar system. That there might be other planet wasn&39;t even a respectable idea.

3. In 1781 a self-taught astronomer, William Herschel, was "sweeping the skies" with his telescope. By March, he had reached the section including the constellation Gemini, and he spotted an object that appeared as a disk rather than a glowing star. Because it moved slightly from week to week, Herschel thought it was a comet. After a few mouths, however, he decided the orbit was circular&39;" and came to the shocking conclusion that it wasn&39;t a comet, but an unknown planet.

4. People were astonished. No one since ancient times had anyone named a planet. Herschel felt that is should be called "Georgium Sirius" (George&39;s Star) after George Ⅲ, the king of England, some wanted to name it "Herschel" after its discoverer. But one influential astronomer suggested "Uranus", after the Greek god of the heavens. That made sense, since it was thought to be the limit of the solar system.

5. Could there be another planet affecting Uranus？ A century earlier, Isaac Newton had come up with laws describing the effects that the gravitational forces of planets have on one another. Using Newton&39;s laws, two young scientists, Jean Leverrier and John Couch Adams set out independently in 1840 to find the unknown planet whose gravitational forces might be pulling on Uranus. Both hoped the unknown planet would be where their calculations said they could find it. Adams finished his calculations first, in September 1845. The following August, Leverrier completed his.

6. Leverrier traveled to the Berlin Observatory in Germany, and the young assistant mana get, Johann Gottfried Galle, agreed to help search for the planet. That was September 23, 1846. That night, Galle looked through the telescope, calling out stars and their positions while a young student astronomer, Heinrich Louis d&39; Arrest, looked at a star chart, searching for the stars Galle described. Finally Galle called out an eighth-magnitude star that d&39; Arrest couldn&39;t locate on the charts. They had found the unknown planet! It had taken two years of research—but only a half hour at the telescope. The honor of the discovery belongs to both Adams and Leverrier, who had essentially discovered the new planet with just a pen and a new set of mathematical laws. The greenish planet was named after Neptune, god of the sea.

Paragraph 3 ______

A. The Planet Uranus Is Named After Greek GodB. The planets concept hasn&39;t always been acceptedC. Sometimes It Takes a Little Bit of Maths And Logic to Matte DiscoveriesD. The Discovery of Uranus Was Made By a Self-taught AstronomerE. You need to be a trained astronomer to discover new things in the skyF. It Was Galle Who First Observed the Planet Nemune

Paragraph 4 ______

A. The Planet Uranus Is Named After Greek GodB. The planets concept hasn&39;t always been acceptedC. Sometimes It Takes a Little Bit of Maths And Logic to Matte DiscoveriesD. The Discovery of Uranus Was Made By a Self-taught AstronomerE. You need to be a trained astronomer to discover new things in the skyF. It Was Galle Who First Observed the Planet Nemune

Paragraph 5 ______

A. The Planet Uranus Is Named After Greek GodB. The planets concept hasn&39;t always been acceptedC. Sometimes It Takes a Little Bit of Maths And Logic to Matte DiscoveriesD. The Discovery of Uranus Was Made By a Self-taught AstronomerE. You need to be a trained astronomer to discover new things in the skyF. It Was Galle Who First Observed the Planet Nemune

Paragraph 6 ______

A. The Planet Uranus Is Named After Greek GodB. The planets concept hasn&39;t always been acceptedC. Sometimes It Takes a Little Bit of Maths And Logic to Matte DiscoveriesD. The Discovery of Uranus Was Made By a Self-taught AstronomerE. You need to be a trained astronomer to discover new things in the skyF. It Was Galle Who First Observed the Planet Nemune

The planet Uranus was discovered______.

A. after each of these planetsB. by chanceC. after a mere mortalD. new objects in the skyE. really help to make discoveriesF. the tug of another planet

The planet Uranus was almost named ________.

A. after each of these planetsB. by chanceC. after a mere mortalD. new objects in the skyE. really help to make discoveriesF. the tug of another planet

Besides maths and observation, a good telescope can______.

A. after each of these planetsB. by chanceC. after a mere mortalD. new objects in the skyE. really help to make discoveriesF. the tug of another planet

The effect of a planet&39;s orbit may be due to______.

A. after each of these planetsB. by chanceC. after a mere mortalD. new objects in the skyE. really help to make discoveriesF. the tug of another planet

请帮忙给出每个问题的正确答案和分析，谢谢！

点击查看答案

第10题

Many scientists today are convinced that life exists elsewhere in the universe—life probab
ly much like that on our own planet. They reason in the following way.

As far as astronomers can determine, the entire universe is built of the same matter. They have no reason to doubt that matter obeys the same laws in every part of the universe. Therefore, it is reasonable to guess that other stars, with their own planets, were born in the same way as our own solar system. What we know of life on earth suggests that life will arise wherever the proper conditions exist.

Life requires the right amount and kind of atmosphere. This eliminates all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere, a larger one would hold too much of it.

Life also required a steady supply of heat and light. This eliminates double stars, or stars that flare up suddenly. Only single stars that are steady sources of heat and light like our sun would qualify.

Finally, life could evolve only if the planet is just the right distance from its sun. With a weaker sun than our own, the planet would have to be closer to it. With a stronger sun, it would have to be farther away.

If we suppose that every star in the universe has a family of planets, then how many planets might support life？ First, eliminate those stars that are not like our sun. Next, eliminate most of their planets, they are either too far from or too close to their suns. Then eliminate all those planets which are not the same size and weight as the earth. Finally, remember that the proper conditions do not necessarily mean that life actually does exist on a planet. It may not have begun yet, or it may have already died out.

This process of elimination seems to leave very few planets on which earthlike life might be found. However, even if life could exist on only one planet in a million, there are so many billions of planets that this would still leave a vast number on which life could exist.

Astronomers believe that matter in different parts of the universe ______.

A．has different laws

B．has one common law

C．shares the same laws

D．shares no common law

点击查看答案
考试指南 全部 >
期货从业资格上海考点苏州基金从业资格考试时间银行业从业资格证书含金量高吗？证券基金从业资格考试科目银行从业资格证报名官网入口中级基金从业资格证考试可以只报一科吗银行从业2024年下半年报名在什么时间期货从业资格证能干啥基金从业资格证领取流程基金从业资格证如何获取
违法和不良信息举报 在线客服
    搜题
    下载APP
    关注公众号
    TOP
    重置密码
    账号：
    旧密码：
    新密码：
    确认密码：
    确认修改
    购买搜题卡查看答案 购买前请仔细阅读《购买须知》
    请选择支付方式
    • 微信支付
    • 支付宝支付
    点击支付即表示同意并接受了《服务协议》和《购买须知》
    立即支付 系统将自动为您注册账号
    已付款，但不能查看答案，请点这里登录即可>>>
    联系客服
    找回账号密码
    请使用微信扫码支付(元)

    订单号：

    遇到问题请联系在线客服

    请不要关闭本页面，支付完成后请点击【支付完成】按钮
    遇到问题请联系在线客服
    恭喜您，购买搜题卡成功 系统为您生成的账号密码如下：
    重要提示：请勿将账号共享给其他人使用，违者账号将被封禁。
    发送账号到微信 保存账号查看答案
    怕账号密码记不住？建议关注微信公众号绑定微信，开通微信扫码登录功能
    请用微信扫码测试
    尊敬的用户，您尚未绑定微信号
    扫码关注微信公众号，开通微信扫码登录功能
    您可能还需要：
    重置密码 查看订单 联系客服
    优题宝