問題詳情
【題組】38.Why are children more vulnerable to air pollution?
(A) Children don’t like to wear face masks.
(B) Children’s brains have fully developed.
(C) Children have not built up their immune system yet.
(D) Children have to go to school every day.
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
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