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Today ,as in every other day of the year ,more than 3000 U.S. adlescentswill smoke their first cigarette on their way to becoming regular smokers asadults. During their lifetime,it can be expected that of these 3000 about 23will be murdered,30 will die in traffic accidents, and nearly 750 will be killedby a smoking-related disease. The number of deaths attributed to cigarettesmoking outweithts all other factors, whether voluntary or involuntary, as acause of death.

Since the late 1970s, when daily smoking among high school seniors reached30 precent , smoking rates among youth have declined . While the decline isimpressive ,several important issues must be raised.

First, in the past several years,smoking rates among youth have declinedvery little. Second,in the late 1970s ,smoking among male high school seniorsexceeded that among female by nearly 10 percent . The statistic isreversing.Third ,several recent studies have indicate high school dropouts haveexcessively high smoking rates, as much as 75 percent .

Finally, thouth significant declines in adolescent smoking have occurred inthe past decade,no definite reasons for the decline exist. Within thiscontext,the Naional Cancer Instiute (NCI) began its current effort to determinethe 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 regularsmoker.

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 ________.

a.NCI has taken effective measures

b.smoking is prevented among high school seniors

c.there are many smokers who have died of cancer

d.none of these

5.What is implied but not stated by the author is that ________.

a.smoking rates among youth have declined very little

b.there are now more female than male smokers among high school seniors四级满分多少

c.high smoking rates are due to the incease in wealth

d.smoking at high school are from low socio-economic backgrounds

答案：bdbdb