问题 选择题

煤化工生产中常研究不同温度下平衡常数、投料比及产率等问题。

已知:CO(g)+H2O(g) H2(g)+CO2(g)的平衡常数随温度的变化如下表:

温度/℃4005008301000
平衡常数K10910.6
      则下列说法错误的是                                                       (   )

A.在830℃,等物质的量的CO和H2O反应达到平衡时,CO的转化率为50%

B.上述正向反应是放热反应

C.某温度下上述反应平衡时,恒容、升高温度,原化学平衡向逆反应方向移动

D.在500℃时,反应达到平衡后,增大压强,化学平衡常数K减小

答案

答案:D

阅读理解

B

As far back as he could remember,Larry had longed to go to Hollywood and become a film star.The young man’s hopes for success were broken again and again,however.Hollywood just did not seem interesting.When he first came to California,Larry had decided never to give up and return home without success.Therefore,he kept on trying.Someday,he told himself,his big opportunity would come.

Larry found a job parking cars for one of Hollywood’s big restaurants.His pay was elementary,but since the guests were kind enough to give him more money,he managed to make a living.One day he recognized an important film director driving into the parking lot (停车场) and getting out of his car.Larry had recently heard that the man was ready to make a new picture.

Larry got into the car and prepared to drive it on into the lot and park it.Then he stopped,jumped out,and ran over to the director.“Excuse me,sir,but I think it’s only fair to tell you that it’s now or never if you want me in your next picture.A lot of big companies are after me.”

Instead of pushing away the boy,the director laughed,then wrote something on a card and handed it to the young man.“Come and see me tomorrow.”

Larry got a small part in the director’s next film.He was on his way!

66.Which of the following was Larry interested in?

A.Working as a waiter.       B.Becoming a film star.

C.Parking cars for film stars.   D.Owing a big company.

67.Why did Larry find a job parking cars?

A.Because he liked the job.

B.Because the parking lot was near Hollywood.

C.To make a living and wait for the opportunity.

D.To see a lot of film stars and work for them.

68.After reading the story what can we infer (推断) about the film director ?

A.He wanted to laugh at Larry.

B.He recognized Larry at first sight.

C.He was kind and gave Larry a try.

D.He thought Larry would become a star.

69.what does the word “elementary” mean in this passage?

A.基本的            B.充足的            C.较高的            D.不达标的

70.“He was on his way”refers to the fact that ________.

A.he gave up and returned home

B.he began to work towards success

C.he took a journey to Hollywood

D.he had difficulty in playing the small part

单项选择题