单选题：The blood of each women was tested once a month during pregn

题目内容：

The blood of each women was tested once a month during pregnancy. A．Right
B．Wrong
C．Not mentioned

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

Nonsmoking mothers were selected because the effect of smoki

Nonsmoking mothers were selected because the effect of smoking on PAHs was uncle

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