单项选择题
21（）
A．comes
B．begins
C．appears
D．shines
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单项选择题
Which of the following statements is NOT true
A．Even windmill' s action depends on the sun.
B．The sun produces enormous energy for man to make use of.
C．Some day man will be able to utilize 100 % of the solar energy that gets to the earth.
D．The sun produces different heating effects in different places.
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单项选择题
The reason why all the solar energy falling on the earth can' t be utilized is that ______ .
A．only a very small part is available
B．the sun is too distant from the earth
C．it takes thousands of years for this energy to be stored up in coal and oil
D．our scientific knowledge is not sufficient
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