【单选题】【消耗次数：1】
The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strains.
①
to compete
②
competing
③
to be competed
④
having competed
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【单选题】
咳嗽与咳痰中，下列错误的是
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咳嗽是一种保护性反射动作
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咳嗽亦属一种病理现象
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