简述信息分析主要目的。

在短文的空格内填入适当的词，填其内容通顺，每空格限填一词，首字母已给。

     A survey has been published which shows that British people don't like their neighbours very much. 80%

of the people who took part in the survey feel that their neighbours 1. h_______  pay attention to others'

feelings. 25% don't talk to the people who live next door and 10% don't even know their names. In fact, one

million people in Britain would like to 2. m_______ because they don't get along well with their neighbours.

     According to the survey, the 3. b_______ problem is noise. Many of the complaints about noise came

from people who live in flats and old houses. These places often have thin walks which can't 4. s_______

the noise from next door.

      The other main problems are disagreements (不和) about car parking spaces, and old people complaining

about the young. Some disagreements last 5. a _______ time. In one case, people who live in the same building

haven't talked to each other for fifteen years. Sometimes the disagreements end in violence.In one of the worst

cases, a mam killed a neighbour because he kept parking in  "his space". 

     Another survey shows that 90% of the neighbours never share a meal, 80% have never had a drink

6. t_______ and 20% have never even spoken. However, when neighbours become each other's 7. f_______,

they are often ready to offer help, as we can see in many parts of the world.

     One solution to such problems is to talk about them with a professional organization and, if necessary, to

sign a written agreement. Now people can get this service in more and more towns.

1._______ 2.________ 3.________ 4.________ 5.________ 6.________ 7.________

由铜、锌、稀硫酸组成的原电池中，下列说法错误的是（  ）

A．锌是负极，其质量逐渐减少

B．氢离子在铜表面被还原，产生气泡

C．电流从锌片经导线流向铜片

D．电子从锌片经导线流向铜片

某学生试图用电解法根据电极上析出物质的质量来验证阿伏加德罗常数值，其实验方案的要点为：

①用直流电电解氯化铜溶液，所用仪器如图。

②在电流强度为IA，通电时间为t s后，精确测得其电极上析出的铜的质量为m g。

试回答：

(1)①连接这些仪器的正确顺序为(用图中标注仪器接线柱的英文字母表示，下同)：E接________，C接________，________接F；

②实验线路中的电流方向为________→________→________→C→________→________。

(2)写出B极上发生反应的电极反应式：________________，G试管中淀粉KI溶液变化的现象为________________，相应的离子方程式是________________。

(3)为精确测定电极上析出铜的质量，所必需的实验步骤的先后顺序应是________。

①称量电解前电极质量 ②刮下电解后电极上的铜并清洗 ③用蒸馏水清洗电解后电极

④低温烘干电极后称量 ⑤低温烘干刮下的铜，后称量 ⑥再次低温烘干后称量至恒重

(4)已知电子的电量为1.6×10^-19C。试列出阿伏加德罗常数的计算表达式：N_A＝________。

什么叫账薄？设置和登记账簿有什么意义？

The first time I remember noticing the crossing guard was when he waved to me as I drove my son to school. He (31) me with a puzzle-all because he waved to me like someone does on seeing a close friend. A big, (32) smile accompanied his wave. For the next few days I tried tO study his face to see if I knew him. I didn’t. Perhaps he had (33) me for someone else. By the time I contented myself with the conclusion that he and I were strangers, we were greeting each other warmly every morning like old friends.

Then one day the (34) was solved. As I approached the school he was standing in the middle of the road (35) his stop sign. I was in live behind four cars. Once the kids had reached the safety of the sidewalk, he lowered his sign and let the cars (36) . To the first he waved and smiled in just the same way he had done to me over the last few days. The kids already had the window down and were happily waving their reply. The second car got the same (37) from the crossing guard, and the driver, a stiff-looking businessman, gave a brief, almost awkward wave back. Each following car of kids on their way to school (38) more heartily.

Every morning I continued to watch the man with interest. So far I haven’t seen anyone (39) to wave back. I find it interesting that one person can make such a difference to so many people’s lives by doing one simple thing like waving and smiling warmly. His (40) armed the start of my day. With a friendly wave and smiling fade he had changed the feelings of the whole neighbourhood.

39（）。

A. fail

B. try

C. wish

D. bother