2. 外语
  3. Even intelligent life on earth couldn’t send radio waves half a century ago. So it would be impossible for any intelligent being

Even intelligent life on earth couldn’t send radio waves half a century ago. So it would be impossible for any intelligent being

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问题 Even intelligent life on earth couldn’t send radio waves half a century ago. So it would be impossible for any intelligent beings to exist on any other planet at that time.
Jupiter and Saturn are com worlds of the solar system.
选项 A、Y
B、N
C、NG
答案A
解析 由倒数第四段的第一句话可知木星和土星是太阳系中的冷行星，此判断正确。
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