单选题
请根据下面的短文回答第66-70题
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 have breathing problems and lung illness 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 mother smoked were 8% less developed than the children whose mothers did not smoke, and that the children whose mothers smoked developed 20% more cold and breathing illness 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.
单选题 Mother who smokes before their child is born may______.
【正确答案】 A
【答案解析】[解析] 根据第一段第一句可知会影响孩子的肺的生长发育，所以答案为A。
单选题 Doctors in Boston studied 1,000 children to______. [A] examine whether these children were healthy [B] find out who smoke [C] find out the condition of children whose mother smoke
【正确答案】 C
【答案解析】[解析] 通读全文可知，研究的目的是想看母亲吸烟对孩子的影响，所以答案为C。
单选题 if a mother smoke, the lungs of the children______.
【正确答案】 C
【答案解析】[解析]根据…the lungs of the children whose mother smoked were 8% less developed than the children whose mothers did not smoke．可知答案为C。
单选题 What disease are the children likely to have if their mother smoke?
【正确答案】 C
【答案解析】[解析] 根据第二段第一句可知吸烟母亲的孩子得肺癌的机率比较高，所以答案为C。
单选题 If parents both smoke, who has a worse effect on children?
【正确答案】 A
【答案解析】[解析] 根据文章最后一句可知父亲吸烟对孩子没有影响，母亲吸烟对孩子造成的不良影响大，所以答案为A。