问题 选择题

在一定条件下,对于反应mA(g)+nB(g)≒cC(g)+dD(g), C物质的浓度(c%)与温度、压强的关系如图所示。

下列判断正确的是(   )

A.△H<0、△S>0

B.△H<0、△S<0

C.△H>0、△S>0

D.△H>0、△S<0

答案

答案:A

由曲线图可知,增大压强,C%减少,即增大压强平衡向逆反应方向移动,所以逆反应为气体体积减小的反应,即;升高温度C%减少,即升高温度平衡向逆反应方向移动,即正反应为放热反应;正确选项为A;

阅读理解

第三部分:阅读(共20小题;每小题1.5分,满分30分)

阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Most people want to know how things are made. They honestly admit, however, that they hardly know a thing when it comes to understanding how a piece of music is made. Where a composer begins, how he manages to keep going – in fact, how and when he learns his trade – all are covered in complete darkness. The composer, in short, is a man of mystery.

One of the first things the common man wants to know about is the part inspiration(灵感)plays in a composer’s work. He finds it difficult to believe that composers are not much interested in that question. Writing music is as natural for the composer as eating or sleeping for all. Music is something that the composer happens to have been born for.

The composer, therefore, does not say to himself: “Do I feel inspired?” He says to himself: “Do I feel like working today?” And if he feels like working, he does. It is more or less like saying to himself: “Do I feel sleepy?” if you feel sleepy, you go to sleep. If you don’t feel sleepy, you stay up. If the composer doesn’t feel like working, he doesn’t work. It’s as simple as that.

66. What would be the best title for the text?

A. Composer: a man of mystery           B. Practice makes good music

C. Relation between sleeping and music       D. Music: product of nature

67. The words “covered in complete darkness” underlined in paragraph 1 most probably mean__________

A. difficult to be made   B. without any light       C. black in color    D. not known

68. Most people seem to think that a composer________.

A. finds it difficult to write music     B. considers it important to have a good rest

C. should like to talk about inspiration  D. never asks himself very simple questions

69. The author will most probably agree that composers_________.

A. are born with a gift for music      B. are people full of mystery

C. work late at night for their music     D. know a lot about eating and sleeping

70. What does the passage mainly talk about?

A. How the music produces.

B. How secret the composer’s work.

C. Why the composer is so popular with people.

D. What the composer often thinks about.

多项选择题