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How many solar heat panels do three or four bedroom homes usually need？
A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.
答案
更多“How many solar heat panels do three or four bedroom homes usually need？A．Three or four.B．F”相关的问题
第1题
How many solar heat panels do three or four-bedroom homes usually need？
A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.
第2题
M: Thank you. As you can see, little by little, Americans are turning to solar power, tapping the strength of the sun for energy.
W: Yeah, that's true. Sunlight has already been used for heating or cooling homes and office buildings in the sunny south.
M: Experts say all signs point to the birth of the solar energy industry. Right now, an increasing number of companies are selling solar collector panels to heat and cool homes or to heat water. The glass and metal panels each cost from ＄100 to more than ＄500, and the three or four-bedroom home usually requires a dozen or more. They look like sandwiches. They are usually placed in rooftops. Nobody knows how many have been sold, and in addition, many people have built their own units. It has been estimated that solar power equipment will be a $1.3 billion industry by 1995, and more than a million homes will use sunlight for heat, air conditioning or to generate electricity, both in the cities and in countryside.
W: Wow! That is really big business.
What do we learn about the use of solar energy in the U. S. ？
A．It is very well established.
B．It is relatively new.
C．It is found in one million homes.
D．It is being rapidly expanded.
第3题
For example, people have for many years been using the【C5】______heat of the sun to cook by solar【C6】______which have been built with several incurred【C7】______reflecting the sun and focusing the heat on the cooking element. This【C8】______can be used like a gas or electric stove; it is more expensive to make but it doesn't need any【C9】______and so costs【C10】______to use. Another【C11】______of using solar energy is in house heating.
The【C12】______of energy we use most is electricity, and every day more is【C13】______. But electricity has to be made too, and to make it huge quantities of fuel is required -- oil, coal, gas and nowadays even uranium.
The question which【C14】______everyone today is: how long will these fuels【C15】______？ Nobody knows it for sure,【C16】______most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a(n)【C17】______here, too.
Solar power has already been used to produce【C18】______heat. In Southern France a solar furnace has been built,【C19】______temperatures reach more than 3 000 centigrade. This furnace is not only used for experiment【C20】______, but could be used to produce steam for a power station.
【C1】
A．power
B．time
C．heat
D．temperature
第4题
How many people died from heat in Chicago in 1995？
A．About 1700.
B．Nearly 1900.
C．Around 1100.
D．Over 600.
第5题
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
第6题
根据短文回答 36～40 题。
Life in the Universe
Many scientists today are convinced that life exists elsewhere in the universe － life probably much like that on our own planet. They reason in the folio, wing way.
As far as astronomers (天文学家) 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 requires a steady supply of heat and light. This eliminates double stars, or tars that flare up (闪耀) suddenly. Only single stab 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.
第 36 题 Astronomers believe that matter in different parts of the universe（）
A．obeys different laws
B．obeys one common law
C．obeys the same laws
D．obeys no common law
第7题
A．problems of space travel
B．scientific methods in space exploration
C．the importance of Venus to the earth
D．conditions on Venus
第8题
The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.
Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450, 000-year-old microorganisms preserved in cores of sediment taken beneath the floor of the Indian Ocean. They provide a record of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth's orbital geometry caused the ice ages.
This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature's interconnectedness, it is possible that the most serious threats have yet to be recognized.
The first paragraph of the text deals mainly with the earth atmosphere's ______.
A．sheltering effect
B．reviving effect
C．invigorating effect
D．cleansing effect
第9题
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 requires 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.
第36题：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.
第10题
Energy from the Sun
Everyone needs and uses energy. If there were no energy,【46】
Most of the energy on this planet comes from the sun, but people do not receive that energy directly. It comes from different sources and in different forms.
Green plants convert the sun's energy to food energy that animals and people use for life. The energy from animals has been used for hundreds of years to operate farm equipment and to pull carts, wagons , and other vehicles.
The sun's energy takes water from rivers, lakes, and oceans and【47】When rain or snow falls on the land some of it flows into rivers and streams. This flowing water can be used to【48】Water can also be converted (更换) to steam, which produces energy to operate machines.
Winds also come from solar energy. Air that has been heated by the sun rises and creates winds. The process of winds has moved ships on the sea, ground grain, and brought water to the earth.
There is also solar energy in wood, oil, and coal. These fuels have been【49】People burn them to produce heat and to create power for machines. Oil and coal are used to produce electrical energy, too. And electricity produces light heat, and sound energy. In addition, electric power operates (操作) many kinds of equipment, tools, and machines, which make work easier.
If you made a list of all the jobs performed by the different kinds of energy, you would fill many pages . The need for power increases every day, and some sources of energy【50】So scientists and technicians are trying to find new ways to produce power.
A. formed over many centuries from plants.
B. returns it to the earth in the form. of rain or snow.
C. are being used up very quickly.
D. there would be no life.
E. produce mechanical energy and electricity.
F. are being produced everyday.
(46)
