例外数量危险品可以通过（）运输。 A.邮件 B.随身携带 C.手提行李 D.货运

　从同样高度落下的玻璃杯，掉在水泥地上容易打碎，而掉在草地上不容易打碎，其原因是： [ ]

A．掉在水泥地上的玻璃杯动量大，而掉在草地上的玻璃杯动量小

B．掉在水泥地上的玻璃杯动量改变大，掉在草地上的玻璃杯动量改变小

C．掉在水泥地上的玻璃杯动量改变快，掉在草地上的玻璃杯动量改变慢

D．掉在水泥地上的玻璃杯与地面接触时，相互作用时间短，而掉在草地上的玻璃杯与地面接触时间长。

含镁3%-5%的镁铝合金，现已成为轮船制造、化工生产、机械制造等行业的重要材料．现有一块已知质量为56.4g的镁铝合金，欲测定其中镁的质量分数，两位同学设计了不同的实验方案．

实验设计Ⅰ：

镁铝合金

①足量盐酸

溶液

②过量NaOH溶液

 过滤，得到沉淀质量为5.8g

实验设计Ⅱ：…

请回答以下问题：

（1）写出实验设计Ⅰ中反应①的离子方程式______；______．

（2）依据实验设计Ⅰ，求出镁的质量分数．（要求写计算过程）

（3）请你为另一位同学设计第Ⅱ种测定镁的质量分数的方案．（写出必要的实验过程）

I shall never forget the night, a few years ago, when Marion J. Douglas was a student in one of my calsses. (I have not used his real name for personal reasons. As he requested.) But here is his real story as he told it before one of our adult – education classes. He told us how tragedy had struck at his home, not once, but twice. The first time he had lost his five-old daughter, a child he adored. He and his wife thought they couldn’t bear that first loss; but, as he said:“Ten months later, God gave us another little girl and she died in five days.”

This double bereavement was almost too much to bear. “I couldn’t take it,” this father told us. “I couldn’t sleep, I couldn’t eat, I couldn’t rest or relax. My nerves were entirely shaken and my confidence gone.” At last he went to doctors; one recommended sleeping pills and another recommended a trip. He tried both, but neither helped. He said:“My body felt as if it was surrounded in a vice(大钳子), and the jaws of the vice were being drawn tighter and tighter.” The tension of grief(悲伤)——if you have ever been paralyzed(使瘫痪)by sorrow, you know what he meant.

But thank God, I had one child left ——a four —year— old son. He gave me the solution to my problem. One afternoon as I sat around feeling sorry for myself, he asked; ‘Daddy, will you build a boat for me?’ I was in no mood to build a boat; in fact, I was in no mood to do anything. But my son is a persistent little fellow! I had to give in.

Building that toy boat took me about three hours. By the time it was finished, I realized that those three hours spent building that boat were first hours of mental relaxation and peace that I had had in months! I realized that it is difficult to worry while you are busy doing something that requires planning and thinking. In my case, building the boat had knocked worry out of the ring. So I determined to keep busy.

The following night, I went from room to room in the house, making a list of jobs that ought to be done. Scores of items needed to be repaired: bookcase, stair steps, storm windows, window-shades, locks, leaky taps. Amazing as it seems, in the course of two weeks I had made a list of 242 items that needed attention.

“During the last two years I have completed most of them. I am busy now that I have no time for worry.”

No time for worry! That is exactly what Winston Churchill said when he was working eighteen hours a day at the height of the war. When he was asked if he worried about his huge responsibilities, he said :“I am too busy. I have no time for worry.”

55.The underlined word “bereavement” in the second paragraph refers to          .

A.having lost a loved one                                   B.having lost a valuable article

C.having lost a profit-making business                D.having lost a well-paid job

56.Marion felt his body as if it was caught in a vice because            .

A.he couldn’t earn enough money to support his family

B.he was suffering from sleeplessness disease

C.he couldn’t get out of mental pressure

D.he felt tired of adult-education classes

57.Marion made a list of over 200 items that needed to be repaired because           .

A.he hadn’t been able to spare time to mend them

B.he wanted to kill his free time by repairing them

C.the items had actually been broken and needed attention

D.repairing the items helped crowd worry out of his mind

58.At the end of the passage, the author wrote about Winston Churchill in order to         .

A.prove that he followed Churchill’s example

B.support his student’s solution to his problem

C.show that he was successful in his career

D.clarify how his conclusion was reached

试述情报研究成果按综述的目的、内容和职能区分？

一旦一个人行为的任何部分损害他人利益，社会就对其有审判权，对这种行为的干涉是否能提高总体福利成为一个公开讨论的问题。假如一个人的行为没有损害他人利益，那么就不应该对其进行社会审判。 作者在上文中主张：

A．社会是不依赖于个人行为的。

B．当一个人的行为对他人有利时，一个社会的总体福利被提高。

C．没有损害他人福利的行为不应当受到社会审判。

D．对个人行为的干涉没有提高总体福利。

E．总体上讲，人们的利益是相互排斥的。