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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
49
管理
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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