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 diseases later in life. Doctors in Boston studied 1,100 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 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 the father’s smoking did not affect a child’s chance of developing lung cancer

49.  Whose baby would have breathing diseases?

A.Mother who smokes cigarettes after their baby are born

B.Mother who smokes cigarettes before their baby are born

C.Mother who don’t smoke at all

D.Mother whose mother smokes

50. Suppose John’s father was a heavy smoker, so was Mary’ mother. According to this study,  _________.

A. John is more likely to develop lung cancer                                                      B. Mary is more likely to develop lung cancer                            

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

D. Neither John and Mary has the chance to develop lung cancer      

51. 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 smoke may affect their children’s health.       

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

阅读理解

　　American doctors say that mothers who smoke 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 1 100 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 a child's chance of developing lung cancer.

1．Doctors in Boston studied 1 100 children to ________.

[　　]

A．examine whether these children were healthy

B．find out whether their mother had smoked

C．find why these children suffered breathing problems

D．look into the effect mothers' smoking had on their children

2．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.

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

[　　]

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 lung cancer

D．Neither John nor Mary has the chance to develop lung cancer

4．The text 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 smoke may affect their children's health

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

阅读理解

　　American doctors say that mothers who smoke 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 1 100 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 a child's chance of developing lung cancer.

1．Doctors in Boston studied 1 100 children to ________.

[　　]

A．examine whether these children were healthy

B．find out whether their mother had smoked

C．find why these children suffered breathing problems

D．look into the effect mothers' smoking had on their children

2．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.

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

[　　]

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 lung cancer

D．Neither John nor Mary has the chance to develop lung cancer

4．The text 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 smoke may affect their children's health

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