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 a child’s chance of developing lung cancer .
68.Doctors in Boston studied 1100 children to
.
A.make sure that these children were healthy
B.find out whether their mother had smoked
C.find why these children suffered breathing problem
D.look into the effect mother’s smoking had on their children
69.According to the text ,which of the following is true ?
A.The lungs of the children whose mothers smoked were 8% less developed than those of other children
B.Mothers who smoked did not reduce the growth of their children’s lungs .
C.The children whose mothers hadn’t smoked developed 20% more cold and breathing diseases than other children .
D.The lungs of the children whose mothers didn’t smoke were 8% less developed than others.
70.Suppose John’s father was a heavy smoker ,so was Mary’s mother According to the
passage ,
.
A.John is more likely to develop lung cancer
B.Mary is more likely to develop lung cancer
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