教学活动就是教师教的活动。( )

（B.[选修4——科学思维常识]

2014年青岛世界园艺博览会位于青岛市百果山森林公园，园区总体规划概括为“两轴十二园”。“两轴”分别为南北向的花轴和东西向的树轴，“十二园”包括七个主体区和五个体验区。园区的设计体现了山海结合的理念，展示出一幅人与自然和谐相处的生态文明画卷。

（1）青岛世界园艺博览会的园区规划设计所体现的辩证思维特征是（4分）

A.整体性  B.严谨性  C.归一性

（2）有同学认为：“辩证思维只强调在动态中把握事物。”运用辩证思维的有关知识分析该同学的看法。（6分）

某工程双代号网络计划如下图所示，图中已标出每项工作的最早开始时间和最迟开始时间，该计划表明（）。

A．工作2—4的总时差为零

B．工作6—7为非关键工作

C．工作2—5的自由时差为零

D．工作3—6的自由时差为零

E．工作1—3的自由时差为2

在病例对照研究中，匹配过头会造成（）

A.降低研究效率

B.提高研究效率

C.对研究效率无影响

D.无法估算暴露因素的作用

E.高估暴露因素的作用

在离心分离法沥青含量试验中，矿料总质量应包含哪些部分？（）

A.坩埚中残渣质量

B.抽提液中矿粉的质量

C.滤纸在试验后的增量

D.容器中留下的集料干燥质量

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.

20（）

A.student

B.man

C.youth

D.peer