American doctors say that mothers who smoke cigarettes before their babies are b

American doctors say that mothers who smoke cigarettes before their babies are born may slow the growth of their babies lungs.They say reduced lung growth could cause the babies to suffer breathing problems and lung disease later in life.Doctors in Boston，Massachusetts studied 1100 children.The mothers of some of the children smoked，the other mothers did not.Doctors found that the lungs of children whose mothers smoked were 8% less developed than the lungs of the other children,the children whose mother 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 father's smoking did not affect a child's chance of developing lung cancer.

1.Mother who smokers before her child is born may .?

A.slow the growth of her baby's lung?

B.cause her baby to suffer breathing problems and lung disease in life ?

C.make her child develop lung cancer ?

D.all of above are right

2.Doctors in Boston studied 1100 children to .?

A.examine whether these children were healthy

B.find out whether their mothers had smoked

C.find why these children suffered breathing problems and lung disease?

D.look into the effect that mother's smoking had on their children

3.Suppose John's father was a heavy smoker，so was Mary's mother.According to this passage，.?

A.John is more likely to develop lung cancer?

B.Mary is more likely to develop lung caner ?

C.John and Mary have the same chance to develop cancer?

D.neither John nor Mary has the chance to develop cancer

4.This passage is to .?

A.warn us of the danger of smoking before children?

B.warn people with breathing problems not to smoke ?

C.warn us that mothers who may affect their children's health?

D.warn us that fathers who smoke may affect their children as mothers

试题答案

答案：D;D;A;C