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.
51. Mother who smokes 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 later in life
C. make her child develop lung cancer D. all of the above are right
52. Doctors in Boston studied 1,100 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
53. Suppose John's father was a heavy smoker, so was Mary's mother. According to passage, .
A. John is more likely to develop lung cancer
B. Mary is more likely to develop lung cancer
C. John and Mary have the same chance to develop cancer
D. neither John nor Mary has the chance to develop cancer
54. This passage is to .
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