Americandoctorssaythatmotherswhosmokecigarettesbeforeth...

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American doctors say that mothers who smoke cigarettes before their babies are born may slow the growth of their babies’ lungs. They say that reduced lung growth could cause the babies to suffer breathing problems and lung disease later in life. Doctors in Boston, Massachusetts studied 1,000 children. The mothers of some of the children smoked, the other mothers did not. Doctors found that the lungs of the children whose mothers smoked were 8% less developed than the lungs of the children whose mothers did not smoke, and that the children whose mothers smoked developed 20% more cold and breathing diseases than other children later in life.

Another recent study found that children had a greater chance of developing lung cancer if their mothers smoked. The study also showed that the danger of lung cancer increased only for sons and not for daughters, and that the father’s smoking did not affect(影響) a child’s chance of developing lung cancer.

1. Who will most probably suffer from lung cancer?

A. A girl whose mother smoked before she was born.

B. A boy whose mother smoked before he was born.

C. A girl whose father smokes.

D. A boy whose father smokes.

2. Which of the following is true? A. The children whose mother smokes get more chances to catch a cold than others.

B. All the children’s lungs are developed equally.

C. When the mother who smokes gave birth to her baby, it already had a certain kind of breathing disease.

D. Girls will probably suffer more than boys.

3. The main idea of the test is that ____________.

A. mothers’ smoking affects their children most

B. in order to keep children healthy, mothers had better not smoke