2. 外语
  3. Life on the planet Jupiter is a possibility which ______. Life on other planets is possible ______.

Life on the planet Jupiter is a possibility which ______. Life on other planets is possible ______.

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问题 Life on the planet Jupiter is a possibility which ______.
Life on other planets is possible ______.
选项 A、when life-evoking conditions exist
B、only when their conditions match those of the earth
C、when the temperature is neither too hot nor too cold
D、when the atmosphere is not too dry
答案A
解析 由第二句话“life is probably a normal phenomenon wherever the conditions are right，with the added qualification that proper conditions are not necessarily only those of the earth．“只要情况适当，生命就可能是一种正常现象，所附带的条件是，适当的情况并不一定仅限于地球上的那些而已”可得出答案。
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