Current studies do not support the hypothesis that multiple vaccines____________

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问题 Current studies do not support the hypothesis that multiple vaccines____________________(破坏、削弱或“耗尽”婴儿的免疫系统)．

选项

答案 overwhelm，weaken，or "use up" the infant’s immune system

解析词汇使用题。本小题考查对词汇的掌握的情况。

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Accordingtothe"hygienehypothesis,"firstproposedin1989,exposuretoa