问题 选择题

在密闭容器中发生下列反应aA(g)cC(g)+dD(g),反应达到平衡后,将气体体积压缩到原来的一半,当再次达到平衡时,C的浓度为原平衡的1.6倍,下列叙述正确的是

A.A的转化率变大

B.平衡向正反应方向移动

C.D的质量分数变大

D.a<c+d

答案

答案:D

题目分析:反应达到平衡后,将气体体积压缩到原来的一半的瞬间,的浓度为原平衡的2倍.但当再次达到平衡时,C的浓度为原平衡的1.6倍,这说明增大压强,平衡向消耗C的逆反应方向移动,因此正方应是体积增大的,即a<c+d,的转化率变小,D的质量分数变小,所以选项ABC都是错误的,D正确,答案选D。

完形填空

“Chinese style road crossing” became a hot topic in China from the end of last year. Now, many cities have started to punish these jaywalkers (乱闯马路的人).

“Chinese style road crossing” means crossing roads without thinking about traffic lights, as long as you are part of a crowd.

Beijing Traffic Management Bureau (北京交通管理局) announced that from April 6, people who do not wait for the green light to cross the road will receive a fine of 10 yuan. Officials from the bureau said that using the diagonal (对角线) to cross the road is also against the rules. Walkers should walk in an “L” shape.

Besides Beijing, many places have also taken steps to stop “Chinese style road crossing”. Provinces such as Sichuan, Shanxi and Zhejiang have already started to fine jaywalkers 5 to 50 yuan since last year.

Road traffic deaths top the list of deaths from non-natural causes in China, Xinhua reported. The action to punish behaviors that go against traffic rules calls on people to realize the importance of traffic safety.

However, many people complain that the red lights last too long. “But as long as the design of traffic lights is the same, everyone should follow the rulers. Otherwise the country will lose its order,” said People’s Daily.

Some cities have also paid attention to the problem. Beijing Traffic Management Bureau, for example, said it would not only focus on punishment, but also improve road safety facilities (设施), such as fixing traffic lights in a more proper way and building overpasses (天桥).

小题1:Was the topic “Chinese style road crossing” very popular last year?

小题2:What is the right way for walkers to cross the road?

小题3:How are jaywalkers in Sichuan punished?

小题4: Why is it necessary to punish those who go against traffic rules?

小题5: Besides punishment, what else do some cities do to solve the problem?

小题6: What’s your opinion on the action to punish jaywalkers?

单项选择题 A1型题