28. I 　　　　　drive to work, but now I 　　　　　walking to.

　 A. used to ; would　　　 B. used to ; used to　　

C. would; am used to　　 D. used to; am used to

27. It’s an informal party, so you needn’t 　　　　　up for it.

　 A. dress　　 B. take　　 C. give　　 D. come

26. In terestingly enough, the two brothers have much in 　　　　　　.

　 A. ordinary　　 B. common　　 C. gereral　　 D. partilular

25. Only when I left my parents for Italy 　　　　how much I loved them.

　 A. I realized　　　 B. I had realized　　 C. had I realized　　 D. did I realize

24. It’s high time you had your hair cut; it’s getting 　　　　.

　 A. too much long　　　　 B. much too long　　

C. long too much　　　　 D. too long much

23. She could do nothing but 　　　　　her father’s advice.

　 A. follow　　 B. to follow　　 C. to followed　　 D. have followed

22. Father was sleeping. You 　　　　　speak loud.

　 A. would rather not　　　 B. would better not　　

C. had not better　　　　 D. had better not

21. I’m not feeling well. I 　　　　　so much food just now.

　 A. shouldn’t eat　　　　　 B. mustn’t have eaten　　

C. shouldn’t have eaten　　 D. mustn’t eat

　　 听下面5段对话，每段对话仅读一遍，听完每段对话后，回答下面5小题。

　　 1、What time does the store open on Friday?

　　　 A. At 7:00 a.m.　　 B. At 9:00 a.m.　 C. At 7:00 p.m.

2. What did Jack do yesterday?

　 A. He had a football match.　　

　 B. He went downtown.

　 C. He went to the No. 2 Middle School.

3. What do we know about the man?

　 A. He has got two concert tickets.　 B. He will visit the woman.

　 C. He doesn’t like pop music.

4. Where are the two speakers now?

　 　A. In the street.　 B. In a stadium.　 C. At a shop.

5. What is Jack now?

　 A. A student.　 B. A teacher.　 C. A physicist.

听第6段材料，回答第6、7题。

6. What does the woman think of California weather?

　 A. warm.　　 B. Changeable.　 C. Cool.

7. When will the man go to the beach?

　 A. Next weekend.　 B. Tomorrow.　 C. This weekend.

听第7段材料，回答8、9题。

8. Where does this conversation probably take place?

　 A. On the phone.　 B. At Mary’s house.　 C. In a shop.

9. When will the speakers meet tomorrow?

　 A. At 11:13 a.m.　　 B. At 1:00 p.m.　 C. At 11:30 a.m.

听第8段材料,回答第10至12题.

10. How much rent will the woman pay for the house?

　 A. $425 a month.　 B. $800 a month.　 C. $850 a month.

11. What’s the probable relationship between the speakers?

　 A. Friends.　　 B. Husband and wife.　 C. Strangers.

12. What do we know about the house?

　 A. It has two bathrooms.　 B. It has two bedrooms.　 C.It is quiet all the day.

听第9段材料,回答第13至16题.

13.Why didn’t the man choose the communication class last term?

　 A. It was boring.　　 B. It was full.　 C. It was hard.

14. At what time of the term does the conversation most probably take place?

　 A. At the beginning of it.　 B. In the middle of it.　 C. At the end of it.

15. How many English professors are there to choose from in English writing class?

　 A. Three.　 B. Four.　　 C. Five.

16. What do we know about the woman?

　 A. She thinks Professor Mahoney is unfair to sudents.　　

　B. She desn’t like writing at all.　　

C. She did better in English writing than the man last.

听第10段材料,回答第17至20题.

17. What wind speed is perfect for kite flying？

　 A. 4 miles per hour.　　 B. 10 miles per hour.　　 C. 25 miles per hour.

18. What is the first thing to do when you want to fly a kite?

　 A. Making sure the place is right for kite flying.

　 B. Making sure the kite is strong enough.

　 C. Making sure the weather is suitable for kite flying.

19. What are the two things are very dangerous for kite flying?

　 A. Houses and power lines.　　 B. Trees and power lines.　　 C. Trees and water.

20. What is the best way to bring back your kite?

　 A. Lowering the kite quickly to the ground.　　 B. Landing the kite with other’s help.

　 C. Catching the kite before it hits the ground.

45.根据下图回答问题：

(1)甲图中能发生在活的成熟的洋葱表皮细胞中的过程是________________(填序号)。

(2)乙图可以用甲图的序号____________表示，乙图中b与c在分子结构组成上不同的部分为__________________。

(3)把乙图中DNA放在含¹⁵N的培养液中复制2次，子代中含¹⁵N的DNA链占总链的比例是____________。若该DNA分子发生了一对碱基对的替换，________(一定、不一定)发生了基因突变。

(4)若甲图中单链RNA有碱基四种，共有100个，其中碱基A有20个，经过过程③的产物中碱基C占该产物的比例是否是30%？__　 。

(5)烟草花叶病毒(单链RNA病毒)能发生甲图中的__________(填序号)，依据碱基互补配对原则，要完成其遗传物质的复制，需要碱基互补配对_________次。