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问题 选择题

影响我市空气质量的气体污染物主要是  [ ]

A. 二氧化碳 氧气 氮气

B. 二氧化硫 二氧化氮 一氧化碳

C. 氢气 二氧化碳 二氧化硫

D. 氮气 二氧化碳 一氧化碳

答案

答案：B

填空题

Part 4


Questions 26-45


·Read the following passage and decide which answer best fits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.
Participation (26) high school sports is not a constitutional right. (27) , it is a privilege, paid for by taxpayers, open to students who promise to (28) certain conduct requirements on and off the field. One of these promises is to (29) from using drugs. Drug use is a serious problem among high school students. Studies show that as many as 500, 000 high school students use muscle-pumping, life-destroying substances such as steroids. Many more use illegal drugs, (30) cause discipline problems and (31) the stage for lifelong (32) .
Drug testing works to (33) and identify use. That is why drug testing is required to compete in the Olympics, the National Collegiate Athletic Association and the National Football League. (34) drug testing was instituted by these organizations, use of performance- (35) drugs has been greatly reduced. We should want (36) in schools.
Indeed, many athletes (37) testing programs, and no wonder. Without testing, athletes have to choose between drug use and a competitive disadvantage (38) the field.
Those who challenge the need for drug testing may be forgetting (39) it is like be an adolescent. Peer pressure is enormous, and one of the few effective counter-weights is the fear of being caught. More importantly, once drug use is (40) , a school can (41) to the student before he or she gets addicted or arrested.
For 25 years, public schools (42) by federal judges and civil libertarians, with results everyone can see. It is time (43) decisions on how to run public schools locally (44) officials. There is nothing unconstitutional about asking those who gain the advantages of school-sponsored athletics to contribute to the safety of other players, the integrity of the game and their own well-being. The Supreme Court should leave these programs (45) .

A．release

B．relieve

C．refrain

D．protect
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单项选择题

备用法则时，一个人工低速稳定性代替正常迎角保护。以下说法哪种正确（）

A.根据飞机重量和缝翼/襟翼形态，低速稳定性在空速大于失速警告速度5节至10节时开始工作

B.系统在失速前一个适当的范围时产生一个音响失速警告（咔咔声+合成语音“STALL”）

C.以上都对
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