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  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.
The chemical structure of a creature from an earth-type planet will very likely be ______.
选项
答案protein-in-water
解析 由第十段可知，作者认为对于生活在和地球环境类似的星球上的生物，其生命的化学基础也很有可能是protein in-water。
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大学英语四级

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