Man can eventually land on Venus only wh

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问题 Man can eventually land on Venus only when

选项 A.the algae have done their workB.the atmosphere becomes coolerC.there is oxygenD.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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