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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 _____.
A.traffic accidents
B.smoking-related desease
C.murder
D.all of these
Every day there are over_____high school strdents who will become regular smoker.A.75
B.23
C.30
D.3000
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
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
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
C.high smoking rates are due to the incease in wealth
D.smoking at high school are from low socio-economic backgrounds
请帮忙给出每个问题的正确答案和分析，谢谢！
| Every year landslides {滑坡} cause 25 to 50 deaths and $1.5 billion in damage in the United States．They account for 15 percent of the deaths from natural disasters in Europe．And in December, a single event killed more than 200 people in the Philippines．Sending workers to stabilize (加固) mountainsides using steel bars and cement (水泥) can help prevent disaster, but it introduces new difficulties．Shaking drills produce harmful dust and loosen heavy, dangerous debris (米屑)．"It's quite a risky job," says Giorgio Pezzuto of D'Appolonia, an engineering company in Italy. D'Appolonia, working with eight other companies, may have an answer: a three-ton robot called Roboclimber．"The idea is to operate a machine far away that can drill without a human being on board,'" says Pezzuto, manager for the project, which is supported by the European Commission．Engineers claim that the machine will be faster and cheaper than manual labor．The robot, a large radio-controlled four-legged mechanical spider (蜘蛛), has cost at least $2 million so far．The final product should be able to climb unstable mountainsides, drill holes, insert bars and cement, and collect data on the slope' s stability．Testing should begin in May. 小题1:The underlined word "event" (in Paragraph l) refers to ___.
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