Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death.
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.
According to the author, the deaths among youth are mainly caused by （）. traffic accidents。 smoking-related desease。 murder。 all of these。
简答容积泵的种类。
对重大安全事故的处理，应由（）牵头。 事故发生地人民政府。 事故责任方主管部门。 外事部门。 公安部门。
注册会计师的责任？
农业统计调查包括的类型是（）。 年度调查。 定期调查。 全面调查。 抽样调查。 重点调查。
口、△、○分别代表三个数字，如果口÷△=○，则下列哪一个结论不正确？（）
