问题 选择题

在25℃时,密闭容器中X、Y、Z三种气体的初始浓度和平衡浓度如下表:

物质XYZ
初始浓度/mol·L-10.10.20
平衡浓度/mol·L-10.050.050.1
下列说法错误的是  (    )

A.反应达到平衡时,X的转化率为50%

B.反应可表示为X+3Y2Z,其平衡常数为1600

C.增大压强使平衡向生成Z的方向移动,平衡常数增大

D.改变温度可以改变此反应的平衡常数

答案

答案:C

完形填空

Bruce shook his money box again.

Nothing! He carefully counted the coins that lay on the bed. All that he had was $24.52. The   31  which he wanted was at least $90. How on earth(究竟) was he going to get the rest of the   32  ?

He knew that his friends all had bicycles. It was hard to hang out(闲逛) with people when you were the only one   33  a bicycle. He thought about   34   he could do. He couldn’t get money from his parents, because he knew they had no extra(额外的) money.

There was only one way to get money, and that was to earn(挣钱) it. He would have to find a job. He decided to ask Mr Clay for   35  .

“Well, you can start right here,” said Mr Clay. “You see, my windows need cleaning and my car needs washing”.

That was the beginning of Bruce’s part-time(兼职) job. For the next three   36  he worked every day after finishing his homework. He took dogs for walks and cleaned rooms.

The day finally came when Bruce   37  his money and found $94.32. He wasted no time and went down to the shop to   38  the bicycle he wanted. He rode home proudly, looking forward to   39  his new bicycle to his friends. Bruce liked his bicycle very much because he had bought it with his own money. At last, his dream came true, and his parents were   40  of him.

小题1:A.car B.bicycle     C.truck

小题2:A.money   B.help  C.food

小题3:A.with      B.without     C.behind

小题4:A.why       B.how  C.what

小题5:A.food      B.advice      C.water

小题6:A.months  B.minutes    C.seconds

小题7:A.lent       B.lost   C.counted

小题8:A.choose   B.sell    C.drive

小题9:A.borrowing     B.showing    C.asking

小题10:A.famous B.strict C.proud

填空题