单选题：CarlSagan believes that Venus might be colonized from earth

题目分类：高中英语
题目类型：单选题
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题目内容：

CarlSagan believes that Venus might be colonized from earth because__________. A．it might be possible to change its atmosphere
B．its atmosphere is the same as the earth's
C．there is a good supply of water on Venus
D．the days on Venus are long enough

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答案解析：

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