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.
Scientists collect radio waves from space in hopes that they might receive planned messages sent by intelligent life on an other world.
选项 A、Y
B、N
C、NG
答案A
解析 由第一段的第一句话可知科学家利用仪器收集无线电波是为了探测外星球的生命现象，故此判断正确。
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