4．反应L(s)+aG(g)bR(g)达到平衡时，温度和压强对该反应的影响如图所示，图中：压强p₁＞p₂，x轴表示温度，y轴表示平衡混合气体中G的体积分数．据此可判断　　　　　　　　　　　　　　　　　 (　)

A．上述反应正方向是放热反应

B．上述反应正方向是吸热反应

C．a＞b

D．a+1＜b

解析：由图给信息可知，随着温度的升高，平衡混合气体中G的体积分数减小，说明该反应正方向为吸热反应；由图知，在相同温度下，增大压强，平衡混合气体中G的体积分数增大，说明该正反应是气体分子数增大的反应，即a＜b.

答案：B

3．在一密闭容器中，反应aA(g) bB(g)达平衡后，保持温度不变，将容器体积增加一倍，当达到新的平衡时，B的浓度是原来的60%，则下列说法不正确的是 (　)

A．平衡向正反应方向移动

B．物质A的转化率增大

C．物质B的质量分数增加

D．a＞b

解析：假设体积增加一倍时平衡未移动，B的浓度应为原来的50%，现在是60%，比假设大，说明平衡向生成B的方向移动，则a＜b，由于平衡向正反应方向移动．A减少，B增多，B的质量分数增加．

答案：D

2．下图是恒温下化学反应“A(g)+B(g) C(g)”的反应速率随反应时间变化的示意图，下列叙述与示意图符合的是　　　　　　　　　　　　　　　　　　 (　)

A．平衡态Ⅰ与平衡态Ⅱ的正反应速率相等

B．平衡移动的原因可能是增大了反应物浓度

C．平衡移动的原因可能是增大了压强

D．平衡状态Ⅰ和平衡状态Ⅱ的平衡常数的大小关系为K₁＜K₂

解析：由图知，平衡态Ⅱ的正反应速率比平衡态Ⅰ大，A错误；增大反应物浓度，正反应速率突然增大，逆反应速率不变，平衡右移，达到新平衡，B项与图象相符；如果增大压强，虽然平衡向正反应方向移动，但应该是正逆反应速率都增大，与图象不符，所以C是错误的；平衡常数只与温度有关，K₁等于K₂，D错误．

答案：B

1．下列叙述中一定能判断某化学平衡发生移动的是　　　　　　　　　　　　 (　)

A．混合物中各组分的浓度改变

B．正、逆反应速率改变

C．混合物中各组分的含量改变

D．混合体系的压强发生改变

解析：如果混合物中各组分的浓度变化而保持各组分的含量不变时，平衡也不移动；使用合适的催化剂，正、逆反应速率都改变，但平衡不移动；如果反应前后气体总物质的量不变，则压强对平衡无影响．

答案：C

你将听到一篇短文，请根据短文内容，填写下面表格中的空缺部分。短文读两遍。

Once there was a poor old woman. She lived by herself in a little house in a village. She didn’t have much money, but she was very kind.

One day a young man named Bill came to her door. He was very thin. He was very hungry and asked the old woman for help.

The old woman said, “Come in and have dinner with me, but my dinner is only some potatoes.”

They had dinner together. After dinner, the old woman told Bill to take some potatoes with him. He thanked her and then left.

Ten years later, Bill came back to the old woman’s door again and gave her a bag of money. She was surprised.

Bill said, “Ten years ago, you gave me some potatoes. I grew some potato plants. From those plants. I grew some more plants. Now I’m a rich farmer. But I’ve never forgotten how kind you were to me.”

　 你将听到一篇短文，短文后有五个问题，请根据短文内容，在每小题所给的A、B、C三个选项中选出最佳选项。短文读两遍。

Last weekend Jack's mother took Jack on a trip to a forest nearby. His father was working so he didn’t come with them. They got up at 7 a. m. on Saturday morning. It was raining when they left. After an hour his mother began to feel sick so they stopped at a drugstore. Then they left and took a small country road. They were driving along when suddenly they saw about twenty sheep in the middle of the road. The sheep were just standing there. They nearly hit one of the sheep. They didn’t move for an hour so Jack and his mother were just sitting there! In the end, they didn’t get to the forest until 11a.m.

　 　你将听到两端段对话，每段对话后有几个小题，请在每小题所给的A、B、C三个选项中选出最佳选项。每段对话读两遍。

听下面一段对话，回答第16和第17两个小题。

W: What can I do for you, sir?

　 M: I’m looking for a sweater for my daughter.

　 W: What about the yellow one?

　 M: I like the color, but I’m afraid it’s too small.

　 W: The red one is larger. Do you like it?

M: Oh, it’s nice. I’ll take it.

　16. Who is the man buying a sweater for?

　17 What color sweater will the man buy at last?

听下面一段对话，回答第18至第20三个小题。

W: Excuse me, Bruce. May I ask you some questions?

M :Yes. Please.

W: Were you born in New York?

M: No, I was born in Boston. And my family moved to New York when I was five. We lived there before we came to China.

W: Have you ever learned Chinese?

M: Yes, I have learned Chinese for two years.

W: Have you ever visited the Great Wall?

M: No, never. But I will visit it next week.

W: Will Peter go with you?

M: No, he is busy.

W: I hope you will have a good trip.

18. Bruce was born in New York, wasn’t he?

19. How long has Bruce learned Chinese?

20. When will Bruce visit the Great Wall?

　 你将听到十段对话，每段对话后有一个小题，请在每小题所给的A、B、C三个选项中选出最佳选项。每段对话读两遍。

6. W: It was Sunday yesterday. What did you do, Tom?

　 M: I went to meet my uncle at the station. But the train was twenty minutes late. I had waited there for about an hour.　　　　　　　

Q: Where did Tom go yesterday?

7. W: Oh, how nice it is!

　 M: Thank you. My father bought it for me on my birthday. Now I can use it to phone and send messages to my friends easily.

Q: What does the boy have?

8. W: What are you doing here?

M: We are enjoying the photos which were taken in People’s Park.

Q: Where were the photos taken?

9. W: Let’s have a picnic today?

M: OK, it’s a fine day.

Q: How is the weather today?

10. W: What would you like to be when you grow up?

M: I enjoy cooking very much.

Q: What does the person want to do when he grows up?

11. W: Are you going to plant trees tomorrow?

M: Yes.

W: Don’t forget to tell me the time. I’d like to join you.

Q: What is the woman going to do tomorrow?

　12. W: Where did he work before he came here?

M: He had worked in America for 20 years and he came here 2 years ago.

Q: How long has the man been here?

13. W: I want to be a teacher when I grow up. What about you, Bob?

M: I want to be a social worker because I like listening to people’s problems and helping them.

Q: What does Bob want to be in the future?

14. W: Why did Ann ask you to stay at home?

M: She wanted me to help her to wash clothes.

Q: What did Ann ask the man to help at home?

15. W: Hi, Ted, the tea is very nice. Where is it grown?

　　 M: It’s grown in China, my hometown.

　　 Q: Where is Ted from?

5. Put up the map on the wall, please.

4. Keep quiet while you are in the reading room.