To get some idea of the amount of heat the sun gives off, think about this. If you could collect all the heat that hits the earth in a two-week period, it would equal the amount of all other known sources and reserves of energy: Wood, coal and oil. But even these sources of energy depend on the sun for their formation. For example, a tree would certainly never grow and provide fuel in the form of wood were it not for the sun.
Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent studying ways to change power from the sun directly into a form of heat.
The process currently in use for collecting energy from the sun--known as solar energy--is quite simple. The sunlight hits a metal plate known as a flat-plate collector and the plate absorbs the heat front the sun. This heat, in turn, heats a liquid inside the plate. A layer of fiber-glass inside the plate helps prevent this heat from escaping. In
A. Ways to change solar energy directly into electricity.
B. Ways to change solar energy into a form of solid.
C. Ways to change solar energy into a form of heat.
D. Ways to change solar energy into a form of liquid.
To get some idea of the amount of heat the sun gives off, think about this. If you could collect all the heat that hits the earth in a two-week period, it would equal the amount of all other known sources and reserves of energy: Wood, coal and oil. But even these sources of energy depend on the sun for their formation. For example, a tree would certainly never grow and provide fuel in the form of wood were it not for the sun.
Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent studying ways to change power from the sun directly into a form of heat.
The process currently in use for collecting energy from the sun--known as solar energy--is quite simple. The sunlight hits a metal plate known as a flat-plate collector and the plate absorbs the heat front the sun. This heat, in turn, heats a liquid inside the plate. A layer of fiber-glass inside the plate helps prevent this heat from escaping. In
A. More.
B. Less.
C. As much as.
D. About the same.
| To get some idea of the amount of heat
the sun gives off, think about this. If you could collect all the heat that hits
the earth in a two-week period, it would equal the amount of all other known
sources and reserves of energy: Wood, coal and oil. But even these sources of
energy depend on the sun for their formation. For example, a tree would
certainly never grow and provide fuel in the form of wood were it not for the
sun. Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent studying ways to change power from the sun directly into a form of heat. The process currently in use for collecting energy from the sun--known as solar energy--is quite simple. The sunlight hits a metal plate known as a flat-plate collector and the plate absorbs the heat front the sun. This A. The usefulness of solar energy. B. Solar energy and its transformation into heat. C. How can solar energy be stored. D. How can solar energy be made to serve man. [单项选择]It’s all advisable idea to get out of the dispute.（ ）
A. wise B. urgent C. useless D. proper [单项选择]It is from the sun（）we get light and heat,（）
A. which; aren’t we B. where; hasn’t it C. in which; doesn’t it D. that; isn’t it [单项选择]______ from the sun ______ we get light and heat.
A. It was ... that B. It is ... that B. It was ... which D. It is ... which [单项选择]Heat energy（）from the sun in a direct way is the most widely used energy today.
A. come B. to come C. coming D. having come [填空题]idea
[填空题]
ruler what
see
something give and get
that selflessness himself more bound therefore life which worthy clear Parents can no more be friends to their children than teachers can be to their students. For the essence of friendship is reciprocity(互惠): giving and getting something like (61) you give. Parents (62) to the proper development of their children, and teachers guide the shaping of their students’ minds. It should be (63) now why real friendship requires more than merely having" (64) in common." It is what people have in common (65) determines the kind of friendship they will have. Real friendship requires at least a sound moral character out of the richness of which individuals are able to (66) this precious affection. The more individuals give, the more they realize a genuine kind of (67) , the better friends they 我来回答: 提交
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