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  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  15
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] The author says that silicones might replace protein on hot planets because silicones may remain stable under very high temperatures.
选项 A、Y
B、N
C、NG
答案 A
解析 由倒数第二段中的“There are molecules called silicones which could conceivably be built into complex structures able to survive high temperatures”及前面的“it could scarcely be based on ordinary protein”可知既然普通的蛋白质不能经受住高温，那么作者推断硅酮有可能取而代之。
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