American doctors say that mothers smoke before their 【S1】______ babies are born may slow the growth of their babies

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问题     American doctors say that mothers smoke before their           【S1】______
babies are born may slow the growth of their babies              【S2】______
lungs. They say’ reducing lung growth could cause                 【S3】______
the babies suffer breathing problems and lung disease              【S4】______
late in life. Doctors in Boston studied 1,100 children.            【S5】______
The mothers of some of the children smoked; the other              【S6】______
Mothers did not. Doctor found out that the lungs of the            【S7】______
children whose mothers smoked were 8% less developed as             【S8】______
the children whose mothers did not smoke, that the                【S9】______
children whose mothers smoked were developed 20% more              【S10】______
cold and breathing diseases than the other children.

选项

答案smoke前加who或smoke→smoking

解析 smoke用来修饰mothers。
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