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In his research, Gerald Wilde finds that technological development and increases in safety

standards______.

A.have helped solve the problem of such high death rate

B.have oddly accounted for mortality rates in the past century

C.have reduced mortality rates for violent and accidental deaths

D.have achieved no effect in bringing down the number of deaths

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第2题
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第4题
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第5题
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第6题
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第7题
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