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单选题成人英语三级

2017-03-26

According to the passage, how is alcohol finally returned to the mother's system?

A．It is carried through the bloodstream.

B．It is transferred across the placenta.

C．It is expelled by the fetus' s liver.

D．It is not completely returned.

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参考答案

B

答案解析

【定位】第四段第一句。
【答案详解】细节判断题。由定位句中“by passing across the placenta”可知，酒精由母体进入胎儿体内的通道是胎盘。

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