填空题

The author says that silicones migth replace protein on hot planets because silicones may remain stable under very high temperatures.

【参考答案】

Y
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The author believes that other life forms are so far away from our planet that we could never meet them.
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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.
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