酸性最强的游离蒽醌是（） A.含羧基者 B.含二个或二个以上β-OH者 C.

抛掷一枚普通的六面体骰子，掷得“6”的概率是______．

根据《生产安全事故报告和调查处理条例》第26条的有关规定，事故调查组在履行事故调查职责时享有的权利包括( )。

A．有权获得相关文件、资料

B．提出事故防范措施和整改意见

C．有权向有关单位和个人了解与事故有关的情况

D．事故调查组在事故调查中发现涉嫌犯罪的，事故调查组可先进行适当处理

E．认定事故性质和事故责任

Marriage is still a popular institution in the United States, but divorce(离婚) is becoming_1_as“popular”.Most American people get married, _2_,at the present time, and fifty percent of American marriages end _3_ divorce. However, four out of five divorced people do not _4_ single. They get married a second time to _5_ partners. Sociologists(社会学家)tell us that in the next century, _6_American people will marry three _7_ four times in one lifetime. Alvin Toffler, an American sociologist, _8_this new social form serial(连续的)marriages. In his book Future Shock, Toffler gives many _9_ for this change in American marriage. In modern society, _10_ lives don't stay the same for very long.Americans_11_ change their jobs, their homes, and their circles of _12_So,the person who was a _13_ husband or wife ten years ago is sometimes not as good ten years _14_After some years of marriage, a husband and wife can _15 _that their lives have become very different, and they don't 16the same interests anymore. For this reason, Toffler says, people in the twenty first century will not _17_ to marry only one person for an _18_ lifetime. They will plan to stay married to one person for perhaps five or ten years, and then marry _19_.Most Americans will expect to have a “marriage carrier”that _20_ three or four marriages.

1. A. already           B. almost          C. ever        D. even

2. A. anyway           B. then            C. but         D. therefore

3. A. with            B. from            C. in          D. for

4. A. live              B. take            C. make       D. stay

5. A .new             B. old              C. young       D. pretty

6. A. most             B. main            C. few         D. mostly

7. A. and             B. by              C. or          D. to

8. A. asks             B. calls             C. tells        D. lets

9. A. causes           B. chances           C. problems    D. reasons

10. A. human's         B. people's          C. person's      D. man's

11. A. frequently       B. quickly           C. rapidly      D. fast

12. A. parents         B. classmates         C. neighbors    D. friends

13. A. polite           B. strict              C. good      D. unfriendly

14. A. late             B. latter           C. lately       D. later

15. A. imagine         B. feel              C. believe     D. suppose

16. A. enjoy           B. hold             C. divide      D. share

17. A. desire          B. plan              C. wish       D. design

18. A. entire         B. extreme           C. total       D. whole

19. A. the other       B. others             C. other       D. another

20. A. appears        B. happens           C. includes     D. carries

如图是安装在安全文明小区进出口的栏杆（栏杆是一根粗细均匀的圆木杆）示意图，当在A处施加一个压力F时，可将栏杆拉到如图所示位置，请在图中画出此时压力F的力臂L₁，和重力G的力臂L₂．

假如你有幸参加中央电视台“开心辞典”的竞赛活动，主持人王小丫给你出这样一道题：他通过 * * 上台，建立军事独裁。他是法国资产阶级利益的捍卫者，欧洲封建君主们的仇敌。请回答，他是

A．华盛顿

B．伏尔泰

C．克伦威尔

D．拿破仑