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A.They might lose control of their members because of the increase in immigration.B.Th..
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A.They had lost their jobs as a result of the Industrial Revolution.B.They had been su..
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在队列研究中,暴露的选择来源通常有:..
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A.Pollution of the environment.B.A new generation.....
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临床试验中采用盲法原则观察结果的优点是..
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A.They found ways to speed up the reproduction of bald eagles.B.They developed new typ..
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