The sun is the source of all of the following EXCEPT______. Of the sun’s total output of radiant energy, the earth receives____

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问题 The sun is the source of all of the following EXCEPT______.
Of the sun’s total output of radiant energy, the earth receives______.

选项 A、one tenth
B、one millionth
C、all that comes from the surface of the sun
D、a very small portion

答案D

解析 本题考查的是考生对全文细节的综合把握。A项和B项数字错误;C项"所有来自太阳表面的(能量)"显然与最后一句中的"只接受到五十万分之一"这个事实相悖;只有D项"非常小的比例"是符合文意的。
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