American doctors say that mothers smoke before their 【M1】

游客2025-07-21 10

问题    American doctors say that mothers smoke before their                   【M1】______
babies are born may slow the growth of their babies                      【M2】______
lungs. They say reducing lung growth could cause                         【M3】______
the babies suffer breathing problems and lung disease                      【M4】______
late in life. Doctors in Boston studied 1, 100 children.                   【M5】______
The mothers of some of the children smoked;the other                      【M6】______
Mothers did not. Doctor found out that the lungs of the                   【M7】______
children whose mothers smoked were 8% less developed as                   【M8】______
the children whose mothers did not smoke, that the                         【M9】______
children whose mothers smoked were developed 20% more                      【M10】______
cold and breathing diseases than the other children. [br] 【M1】

选项

答案 smoke改成smoking

解析本句意为：美国医生说在孩子出生前妈妈吸烟会减慢孩子肺部的生长。smoke用做定语，必须改用动名词形式。

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