Man can eventually land on Venus only wh

练习题库2022-08-02 18

问题 Man can eventually land on Venus only whenA.the algae have done their workB.the atmosphere becomes coolerC.there is oxygenD.it rains there

选项 A.the algae have done their work
B.the atmosphere becomes cooler
C.there is oxygen
D.it rains there

答案 D

解析由最后一段中“before man can set foot on Venus it will be necessary for the oxygen to pro．duce rain”可知，只有金星上有降雨，人类才最终有可能在上面着陆。所以正确答案为D。

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