主开关在ON位时：（）.A.APU开车 B.电子控制盒被供电 C.进气风门关闭

肺痨的显著特点是

A．独立的慢性传染性疾病
B．多种慢性疾病虚损证候的总称
C．五脏并重
D．传染性
E．肺

已知W、X、Y、Z为短周期元素,W、Z同主族，X、Y、Z同周期，W的气态氢化物稳定性大于Z的气态氢化物稳定性，X、Y为金属元素，X单质的还原性大于Y的单质的还原性。下列说法正确的是

A．W与X形成的化合物中只含离子键

B．W的气态氢化物的沸点一定高于Z的气态氢化物的沸点

C．X、Y、Z、W的原子半径依次减小

D．若W与Y的原子序数相差5，则二者形成化合物的化学式一定为Y2W₃

以上哪种类型是根据阻生智齿的长轴与第二磨牙长轴的关系而进行的分类（）

A.第Ⅱ类阻生

B.第Ⅲ类阻生

C.颊侧移位

D.低位阻生

E.倒置阻生

孔雀舞中“孔雀嘴”手形的语意是（）。

A、展现孔雀的嘴型

B、表现孔雀的高傲

C、表达吉祥如意

D、展示高贵圣洁

Drug use is rising dramatically among the nation’ s youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1) from 12 to 17 jumped 50 percent. One in five high school seniors (2) marijuana daily. Monitoring the Future, which (3) student drug use annually, reports that negative attitudes about drugs have declined for the fourth year in a row. (4) young people see great risk in using drugs. Mood-altering pharmaceutical drugs are (5) new popularity among young people. Ritalin, (6) as a diet pill in the 1970s and now used to (7) hyperactive children, has become a (8) drug on college campuses. A central nervous system (9) , Ritalin can cause strokes, hypertension, and seizures. Rohypnol, produced in Europe as a (10) tranquilizer, lowers inhibitions and suppresses short-term memory, which has led to some women being raped by men they are going out with. (11) taken with alcohol, its effects are greatly (12) . Rock singer Kurt Cobain collapsed from an (13) of Rohypnol and champagne a month before he committed (14) in 1994. In Florida and Texas, Rohypnol has become widely abused among teens, who see the drug as a less expensive (15) for marijuana and LSD. Alcohol and tobacco use is increasing among teenagers, (16) younger adolescents. Each year, more than one million teens become regular smokers, (17) they cannot legally purchase tobacco. By 12th grade, one in three students smokes. In 1995, one in five 14-year-olds reported smoking regularly, a 33 percent jump (18) 1991. Drinking among 14-year-olds climbed 50 percent from 1992 to 1994,and all teens reported substantial increases in (19) drinking. In 1995, one in five 10th graders reported having been drunk in the past 30 days. Two-thirds of high school seniors say they know a (20) with a drinking problem.

6（）

A.described

B.prescribed

C.inscribed

D.instructed