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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 being
Even intelligent life on earth couldn’t send radio waves half a century ago. So it would be impossible for any intelligent being
admin
2013-06-17
61
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.
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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0
大学英语四级
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