2. 外语
  3. American doctors say that mothers smoke before their 【M1】______ babies are born may slow the growth of their

American doctors say that mothers smoke before their 【M1】______ babies are born may slow the growth of their

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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.
【M7】
选项
答案Doctor改成Doctors
解析 表示一类人时用名词加s或冠词加名词的形式来表示。
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