问答题

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

【参考答案】

overwhelm，weaken，or“use up”the infant’s immune system
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单项选择题
A．She is going to Hawaii.B．She has traveled all over the world.C．She likes postcards.D．She is going on vacation.
A．She is going to Hawaii.
B．She has traveled all over the world.
C．She likes postcards.
D．She is going on vacation.
填空题
tourists
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