The energy which the sun radiates(輻射) goes in every direction. But only a minute part of it falls on the earth. Even so, it radiates power of about 5,000,000 horsepower per square mile per day. The sun gives us as much energy every minute as mankind uses in a year. At present, we use this energy indirectly, and it is our final source of power.

Coal(煤) represents the chemical action of the sun on green plants thousands of years ago. Water power results from the rain formed by vapor when water changes into gas under the sunshine. Even windmills(風(fēng)車磨坊) operate because of air current(流) starts moving by the different heating effects of the sun in different places.

Someday, through chemistry or some types of solar engine, we should use this great source of energy more directly. Already a scientist has worked out an engine, surprisingly doing well, in which the sun’s rays are concentrated through mirrors on water to create steam.

1.What do the underlined words “a minute” mean in this passage?

A.一分鐘 B.一點(diǎn)點(diǎn) C.片刻 D.一份筆記

2.How much energy does the sun radiate every ten square miles per day?

A.About 5,000,000 horsepower B.About 208,333 horsepower

C.About 100,000,000 horsepower D.About 50,000,000 horsepower

3.Which of the following statement is not true, according to the passage?

A.Even windmills turn because of the sun.

B.The sun produces enormous energy for man to make use of.

C.Someday man will be able to use 100% of the solar energy that gets to the earth.

D.The sun produces different heating effects in different places.

4.This passage is mainly about _______.

A.water power B.our final source of power

C.how water power is produced D.the amount of solar energy that can be used

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