大学英语四级阅读理解试题及答案(一)

Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised.

First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent .

Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth.

1.According to the author, the deaths among youth are mainly caused by _____. a.traffic accidents

b.smoking-related desease

c.murder

d.all of these

2.Every day there are over_____high school strdents who will become regular smoker.

a.75 b.23 c.30 d.3000

3.By "dropout" the author means______.

a.students who failed the examination

b.students who left school

c.students who lost their way

d.students who were driven out of school

4.The reason for declining adolescent smoking is that ________.