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The increasing risk of low immunity which children face is caused by______.
A.their exposure to chemicals
B.their refusal of getting shots of vaccines
C.the doctors' irresponsibility
D.the poor quality of vaccines

A.
A.their
B.their
C.the
D.the

【参考答案】

A
细节题。根据关键词定位于最后一段的最后一句Whatwefoundwasthattherewasanincreasingriskthattheydidn’tworkifthekidshadbeenexposedtothePFCs。A项比较符合题意,故选A。
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