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.
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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大学英语四级

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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

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Theadvantagesanddisadvantagesofalargepopulationhavelongbeenasubjectofdiscussionamongeconomists.Ithasbeenargu

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