下列各酸的酸度相等时，哪种溶液的摩尔浓度最大（） A.HClO4 B.CH3COOH

阅读理解    

        These days computer games have become more and more popular in

many cities and towns. A lot of small shops along busy streets have changed

into computer game houses in order to get more money. These places are

always crowded with people.      

         In the computer game houses, people spend a lot of money matching

on the machines. It's hard for one to beat a computer,but one can get ahead

after trying again and again. People want to win when they play computer

games. The more they lose, the more they want to win, and at last they

even cannot live without it.   

        The result is that some people don't want to work and take days off.

They play in computer game houses for hours and hours. For school boys,

things are even worse. They have no mind for their lessons. When school

is over,they rush to the computer game houses near their schools. Some

of them can get enough money from their parents. Some of them are not

lucky enough to get money. They begin to steal others' money and become

 bad.    

        Computer games addiction is a serious problem in our life.

Something has to be done to stop it.

1.Today there are many _______ instead of small shops along the streets.    

A. big supermarket   

B. computer game houses   

C. popular theaters     

D. modern buildings

2.People spend much money matching on the computers because               .    

A. it is not easy for people to beat the computers   

B. they haven't got anything else to do every day   

C. the computer game houses are always crowded with people  

 D. they want to get money from matching on the machines

3.Some people don't want to work because                  .  

A. they cannot get money from it     

B. playing computer games is better than working   

C.They have been in the habit of playing computer games   

D. playing computer games is more popular

4.As a student, playing computer games                   

A. will make him become bad    

B. can make him clever     

C. will have no mind for his lessons    

D. both A and C

5.Which of the following is NOT false?    

A. All the students can get more money from their parents if they play computer games.  

B. People will have good jobs if they are good at playing computer games.    

C. It is important to do something to stop people from playing computer games. 

D. Many people, old and young, can make money from playing computer games.

下列命题中正确的是（　　）

A．有一组邻边相等的四边形是菱形

B．有一个角是直角的平行四边形是矩形

C．对角线垂直的平行四边形是正方形

D．一组对边平行的四边形是平行四边形

阅读下面语段，按要求回答问题：

菲尔丁说：“不好的书也像不好的朋友一样，可能会把你戕害。”这话没错。但也不必为此走向极端，夸大书籍对人的品格的影响。更多的情况是：。

填入横线上最恰当的是（　　）。

A．好人读了坏书受害至深，坏人读了好书受益甚微

B．好人读了好书取其精华，坏人读了坏书取其糟粕

C．好人读了好书好上加好，坏人读了坏书不可救药

D．好人读了坏书仍是好人，坏人读了好书仍是坏人

下列哪一种文件的存储设备不支持文件的随机存取

A．磁盘

B．光盘

C．软盘

D．磁带

2013年3月22日-28日是第几届“中国水周”？