| 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]
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. [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 [判断题]Fat cells block body heat from escaping quickly.
[填空题]Earth’s surface releases some of the heat from the Sun as______.
[单项选择]Heat Wave on the Way
Forecasters are predicting that there will be extremely hot weather for the next week. A massive high pressure system is expected to settle over the country, (28) fine weather and soaring temperatures with it. Experts believe it could even reach over 37 degrees Celsius during the daytime, which would be a record for the region. The authorities are expressing concern about the possible dangers this heat wave presents. In particular, the elderly are at risk from heatstroke and other potentially (29) medical complications. In the past, similar heat waves recorded in big cities like Paris and Chicago have resulted in hundreds of deaths. Accordingly, residents are urged to keep cool, and to drink as much water as possible over the next few days. People should also take care to (30) the condition of any elderly friends, relatives and neighbors that they have. A. bring B. brought C. bringing D. to bring 我来回答: 提交
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