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[主观题]

The sun is a star.（46)That is because it is near us; but the other stars are far away. The

The sun is a star.(46)That is because it is near us; but the other stars are far away. The sun shines because it is very hot, but the moon shines because it reflects the sun&39;s light. It is like a big mirror. If we visited the moon, we should see the earth.(47).

Sometimes the earth moves between the sun and the moon. Then the earth&39;s shadow falls on the moon; no light from the sun can then reach the moon. The moon gets dark because it cannot reflect the sun&39;s light. (48).

Does the sun ever get dark during the say？ It does so when the moon hides it. Sometimes the moon goes in front of the sun. We can watch its edge when it slowly crosses the sun&39;s disc. Everything gets darker and darker; then, at last, we cannot see any part of the sun&39; s disc. The moon is hiding it completely. That is a total eclipse of the sun; sometimes only part of the sun&39;s disc is hidden; that is not a total eclipse.(49).

(50)There was a total eclipse of the moon on January 9, 2001. That event was visible from Europe, Africa and Asia. There were about 20 total eclipses of the sun between 1970 and 1999. The latest was seen on June 21 this year in Angola, Zambia, Zimbabwe, Mozambique and Madagascar.

(46)

A. Eclipses are not seen in every part of the world.

B. The earth&39;s shadow was beginning to move away.

C. We call this an eclipse of the moon.

D. It appears to be bigger than any other star.

E. It is also like a mirror and it reflects the light of the sun.

F. It is a partial eclipse of the sun.

(47)

A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.

(48)

A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.

(49)

A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.

(50)

A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.

请帮忙给出每个问题的正确答案和分析，谢谢！

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发布时间：2021-04-24

更多“The sun is a star.（46)That is because it is near us; but the other stars are far away. The”相关的问题

第1题

The sun is closer to us than any other star.The sun is ____ ______ to us of all the star

The sun is closer to us than any other star.

The sun is ____ ______ to us of all the stars.

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第2题

The sun looks bigger than________ star. The moon looks bigger than________ star.

A.any; any other

B.any; any

C.any other; any

D.any other; any other

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第3题

Long, long ago people thought that the sun went around the earth. In some countries, peopl

e said that the sun was a god(神). They thought that he drove across the sky each day on a golden (金色的) horse.

But now we know the earth goes around the sun. Today men know how far it is for the earth to go around the sun. They tell us that the earth travels over 1000miles (英里)a minute on its way around the sun.

The sun is really a star. It is much bigger than the earth and it is very hot. Some people have been to the moon, but we know that no one can ever get to the sun. It is too hot for people to live anywhere near it. The sun is 300, 000 times heavier than the earth and more than a million(百万) times larger.

In some countries, people ______ the sun to be a god, riding a golden horse.

A．took

B．gave

C．thought

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第4题

听力原文： We experience different forms of the Sun's energy every day. We can see its ligh

t and feel its warmth. The Sun is the major source of evaporation of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms on the Earth.

Much of the energy that comes from the Sun never reaches the Earth's surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the Earth's surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.

Many gases found in the atmosphere actually reflect heat energy escaping from the Earth's surface back to the Earth. These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.

When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. For example, you've probably noticed how bright snow is when sunlight falls on it. Snow reflects most of the energy from the Sun, so it contributes to the low temperatures of winter. Dark-colored surfaces, such as dark soil or forest, absorb more energy and help warm the surrounding air.

What is the major source of evaporation of water from the oceans and lakes？

A．The moon.

B．The sun.

C．The star.

D．The earth.

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第5题

根据下列文章,请回答 51～65 题。 Save Energy At Home On the average, Americans waste as

根据下列文章,请回答 51～65 题。

Save Energy At Home

On the average, Americans waste as much energy as two-thirds of the world's population consumes. That's largely the__________ (1) of driving inefficient cars, using inefficient appliances (设备), and living and working in poorly insulated (隔热) buildings. Then what can you do to __________ (2) the situation ？

Buy energy-efficient products -- Buy new appliances or electronics of the highest energy-efficiency rating. New energy-efficient models may cost more initially, but have a lower operating__________ (3) over their lifetimes. The most energy-efficient models __________ (4) the Energy Star label, which identifies products__________ (5) use2040 percent less energy than standard new products. According to the EPA(美国环境), the typical American household can save about $400 per year in __________.(6) bills with products that carry the Energy Star.

Switch to compact fluorescent bulbs (荧光灯)－－Change the three bulbs you use (7) in your house to compact fluorescents. Each compact fluorescent bulb will keep half a ton of CO2 out of the air__________(8) its lifetime. ___________(9), compact fluorescent bulbs last ten times as long and can save $30 per year in electricity costs.

Set heating and cooling temperatures correctly -- Check thermostats (温度自动调节器) in your home to make sure they are__________(10) at a level that doesn't waste energy.

Turn off the lights -- Turn off lights and other electrical appliances such as televisions and radios when you're not __________ (11) them. Install automatic timers for lights that people in your house frequently__________ (12) to turn them off when leaving a room.

Let the sun shine in -- The cheapest and most energy-efficient light and heat source is often right outside your window. On __________ (13) days, open blinds (百叶窗)to let the sun light your home for free. Also remember that__________ (14) entering room equals passive solar heating. Even on cold winter days, sun streaming into a room can raise the temperature by several __________ (15).

第 51 题

A．power

B．result

C．way

D．work

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第6题

Save Energy at HomeOn the average, Americans waste as much energy as two-thirds of the wor

Save Energy at Home

On the average, Americans waste as much energy as two-thirds of the world's population consumes. That's (1)the result of driving inefficient cars, using inefficient appliances, and living and working in poorly insulated buildings. Then what can you do to improve the (2)？ Buy energy-efficient products. — Buy new appliances or electronics of the highest energy-efficiency rating. New energy-efficient models may cost more initially, but have a lower operating (3)over their lifetimes. The most energy-efficient models (4)the Energy Star label, which identifies products that use 20 — 40 percent less energy than standard new products. According to the EPA, the typical American household can save about $ 400 per year in (5)bills with products that carry the Energy Star. Switch to compact fluorescent bulbs. — Change the three bulbs you use (6)in your house to compact fluorescents. Each compact fluorescent bulb will keep half a ton of carbon dioxide out of the air over its lifetime. (7), compact fluorescent bulbs last ten times as long and can save $ 30 per year in electricity costs. Set heating and cooling temperatures correctly. — Check thermostats in your home to make sure they are (8)at a level that doesn't waste energy. Get an electronic thermostat that will allow your furnace to heat the house to a lower temperature when you're sleeping and return it to a more (9)temperature before you wake up. Turn off the lights. — (10)lights and other electrical appliances such as televisions and radios when you're not using them. lnstall automatic timers for lights that people in your house frequently forget to turn them off when (11)a room. Choose renewable energy.— Many consumers can now choose their energy supplier. If you have a choice, choose an electric utility that uses renewable power (12), such as solar, water or wind. Let the sun shine In. — The cheapest and most energy-efficient light and heat source is often right outside your windows. On (13)days, open blinds to let the sun light your home for free. Also remember that (14)entering a room equals passive solar heating. 'Even on cold winter days, sun streaming into a room can raise the temperature by several (15) .

dioxide n.二氧化物 insulate adj. 隔热 thermostat n. 温度自动调节器 rating n.等级级别 timer n. 定时器 fluorescent adj.荧光的 blind n.百叶窗

A．unlikely

B．largely

C．tremendously

D．vastly

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第7题

Save Energy At Home On the average, Americans waste as much energy as two-thirds of the wo

Save Energy At Home

On the average, Americans waste as much energy as two-thirds of the world's population consumes. That's largely the(51)of driving inefficient cars, using inefficient appliances (设备), and living and working in poorly insulated (隔热) buildings. Then what can you do to(52)the situation？

Buy energy-efficient products -- Buy new appliances or electronics of the highest energy-efficiency rating. New energy-efficient models may cost more initially, but have a lower operating(53)over their lifetimes. The most energy-efficient models(54)the Energy Star label, which identifies products(55)use 20-40 percent less energy than standard new products. According to the EPA (美国环境保护署), the typical American household can save about $400 per year in(56)bills with products that carry the Energy Star.

Switch to compact fluorescent bulbs (荧光灯) -- Change the three bulbs you use(57)in your house to compact fluorescents. Each compact fluorescent bulb will keep half a ton of CO2 out of the air(58)its lifetime.(59), compact fluorescent bulbs last ten times as long and can save $30 per year in electricity costs.

Set heating and cooling temperatures correctly -- Check thermostats (温度自调节器) in your home to make sure they are(60)at a level that doesn't waste energy.

Turn off the lights -- Turn off lights and other electrical appliances such as televisions and radios when you're not(61)them. Install automatic timers for lights that people in your house frequently(62)to turn them off when leaving a room.

Let the sun shine in -- The cheapest and most energy-efficient light and heat source is often right outside your window. On(63)days, open blinds (百叶窗) to let the sun light your home for free. Also remember that(64)entering a room equals passive solar heating. Even on cold winter days, sun streaming into a room can raise the temperature by several(65).

A．power

B．result

C．way

D．work

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第8题

According to paragraph 4，which of the following is NOT true about a protostar？A．It develop

According to paragraph 4，which of the following is NOT true about a protostar？

A．It developed into a massive star during the Big Bang．

B．It evolved from pre-stellar gases．

C．It was able to integrate heavy elements when evolving into a massive star．

D．It had a mass of one percent of the sun．

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第9题

请根据短文的内容，回答题。 Save Energy at HomeOn the average, Americans waste as much energy

请根据短文的内容，回答题。

Save Energy at Home

On the average, Americans waste as much energy as two-thirds of the world&39;s population consumes. That&39;s largely the __________ .(51) of driving inefficient cars, using inefficient appliances (设备), and living and working in poorly insulated (隔热)buildings. Then what can you do to __________ (52) the situation？＜br＞

Buy energy-efficient products--buy new appliances or electronics of the highest energy-efficiency rating. New energy-efficient models may cost more initially, but have a lower operating __________ (53)over their lifetimes. The most energy-efficient models __________ (54) the Energy Star label, which identifies products __________ (55) use 20-40 percent less energy than standard new products.＜br＞

According to the EPA (美国环境保护署), the typical American household can save about $400 per year in __________ (56) bills with products that carry the Energy Star.＜br＞

Switch to compact fluorescent bulbs (荧光灯) --change the three bulbs you use __________ .(57)in your house to compact fluorescents. Each compact fluorescent bulb will keep half a ton of CO2 out of the air __________ (58) its lifetime. __________ .(59), compact fluorescent bulbs last ten times as long and can save $30 per year in electricity costs.＜br＞

Set heating and cooling temperatures correctly--check thermostats (温度自动调节器) in your home to make sure they are __________ (60) at a level that doesn&39;t waste energy. Turn off lights and other electrical appliances such as televisions and radios when you&39;re not __________ .(61) them. Install automatic timers for lights that people in your house frequently __________(62) to turn them off when leaving a room. Let the sun shine in--the cheapest and most energy-efficient light and heat source is often fight outside your window. On __________ (63) days, open blinds (百叶窗) to let the sun light your home for free. Also remember that .(64) entering a room equals passive solar heating.＜br＞

Even on cold winter days, sun streaming into a room can raise the temperature by several __________ (56).

__________ 查看材料

A.power

B.result

C.way

D.work

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第10题

In many stories on TV and in science-fiction books, men travel to faraway stars. They have

quick, easy journeys. But so far, men have been able to reach only the earth's own moon.

Suppose a man wanted to reach a distant star. Even if he traveled his whole life, he would have to move faster than the speed of light. Nothing can move that fast except light itself.

Strange things happen to an object when it moves rapidly. The object weighs more. An object moving at 86 percent of the speed of light is twice as heavy as it is at rest. A stick appears shorter. A clock runs more slowly. A man would not age so fast as he would on the earth.

Light travels more than 186, 000 miles a second, or about 11 million miles a minute. In one year, light travels six trillion(万亿) miles. That great distance is called a light-year. It is used to measure distances in space.

The star closest to our sun is Alpha Centrauri (半人马座a星). It is more than four lightyears away. If one traveled at the speed of light, he could make a round trip to Alpha Centauri in nine years. But, even at that speed, he could not reach Alcaid (北斗星)in the handle of the Big Dipper. A one-way journey to Alcaid would take almost 200 years!

Why do we measure the distance in light-years instead of miles？

A．Units of light-years sound better.

B．Using light-years reduced the number of figures used.

C．We used to measure distance in light-years long ago.

D．We do not make mistakes when we use light-years.

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