How many times have the doctors tested the children for five years? Which of the following is NOT true?

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问题 How many times have the doctors tested the children for five years?
Which of the following is NOT true?

选项 A、The mothers’ smoking during pregnancy could have affected the children’s lungs.
B、Doctors are sure that children whose mothers smoked developed 20% more colds, flu and other breathing diseases than other children.
C、Doctors are sure when the mothers’ smoking affected the children’s lungs.
D、Smoke-filled air at home could have affected the children’s lungs.

答案C

解析 答案选C。根据文章,医生并不确定母亲抽烟到底在什么时候影响了孩子:是在怀孕时呢,还是孩子出生后呢?
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