[简答题]The nuclear energy is released at the Sun’s center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very’ much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to/be re-emitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and re-emitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun’s light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.
2. It is uncontroversially true that things might have been otherwise than they are. I believe, and so do you, that things could have been different in countless ways. But what does this mean Ordinary languag

[简答题]The nuclear energy is released at the Sun’s center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very’ much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to/be re-emitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and re-emitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun’s light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth. 2. It is uncontroversially true that things might have been otherwise than they are. I believe, and so do you, that things could have been different in countless ways. But what does this mean Ordinary language p

[单项选择]We experience different forms of the sun’s energy every day. The sun is the major source of energy for our planet. It causes the evaporation(蒸发)of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food.
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 form leaving. They are there
A. the atmosphere surrounding the earth
B. water from oceans and lakes
C. energy from the sun
D. greenhouse gases in the sky

[填空题]
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 brough

[单项选择]

The energy which the sun radiates goes in every direction, and only a minute part of it falls on the earth. It is reported that some scientists believe less than 1% of the solar energy fallen on the earth has been used so far. Even so, it represents power of approximately 5, 000,000 horsepower per square mile per day; the sun gives us as much energy every minute as mankind utilizes in a year. At present, because of the lack of scientific knowledge, we use this energy indirectly, and it is our only final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Waterpower results from the sun’s creating vapor and subsequent rain. Even windmills operate because of air currents set in motion by the different heating effects of the use this immense source of energy more directly. Already, scientists have worked out a new type of energy, surprisingly efficient, in which the sun’s rays are concentrated through mirrors on a tube
A. tidy
B. sunny
C. tiny
D. heavy

[单项选择]Techniques to harness the energy of the sun are being developed.
A. convert
B. store
C. utilise
D. receive

[单项选择]Not all the solar energy released by the sun reaches the earth’s surface. About 34% is scattered into space by the gases or dust in the atmosphere. Another 19% is absorbed by the different layers of the atmosphere. The remaining 47% finally reaches the ground where it is absorbed as heat.
How much of the solar energy is absorbed as heat
A. 19%
B. 34%
C. 53%
D. 47%.