2. 职称英语
  3. Even intelligent life on earth couldn’t send radio waves half a century ago. So

Even intelligent life on earth couldn’t send radio waves half a century ago. So

游客2023-07-11  17
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. [br] In terms of chemical structure, the passage mainly discusses three substances. They are ______.
选项
答案 protein，ammonia and silicone
解析 通读全文可知作者认为根据温度的不同，生物的化学基础就有所不同。它们分别是适于低温的“氨”，适于高温的“硅酮”和介于中间的“蛋白质”。
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