题目内容
As long as nuclear reactors exist, the hazard of radiation is ____________.
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Not once in my life had I been able to look a male friend _____ the eye and say the same thing.
___________, Geoffrey's illness proved not to be as serious as we had feared.
He was so curious to know what was in the letter that he could not _________ himself _____ opening it.
生态因子中的生物因子主要包括
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