听下面5段对话,回答1-5题

1. What will the weather be like this afternoon?

A. Sunny.            B. Windy.            C. Rainy.

2. Where does the conversation most probably take place?

A. In an office.        B. In a restaurant.      C. At home.

3. What does the boy want to be in the future?

A. A businessman.     B. A lawyer.          C. A professor.

4. What is the man doing?

A. Offering help.     B.  Expressing thanks.   C. Asking for permission.

5. What does the man mean?

A. He'll deliver the luggage by car.    B. He won't take the luggage with him.

C. He doesn't need any help with the luggage.

听第6段对话,回答6--8题

6. Where does this conversation take place?

A. In a restaurant.   B. In a night club.   C. In a supermarket.

7. What kind of snack does the woman have?

A. Pancake.           B. Chips.             C. Salad.

8. How much does the woman pay for the things she asked?

A. 75 pence.          B. 1.30 pounds.       C. 2.05 pounds.

听第七段对话,回答9-11题

9. Which age group do the two speakers most likely belong to?

  A. Young.            B. Middle-aged.        C. Old.

10. Which part of the body is probably OK with the woman?

A. Her leg.          B. Her back.          C. Her eyes.

11. Why can't the man do gardening a lot?

A. Because of his back trouble.   B. Because of his leg trouble.

C.  Because of his arm trouble.

听第八段对话,回答12-14题

12.  How does the man feel?

A. Happy.           B. Sad.              C. Excited.

13. What's wrong with the man?

A. He was knocked down by a car.

B. He had an accident when he was walking along the street.

C. He had an accident in the car.

14. Why did it happen?

A. Because there's something wrong with the driving mirror.

B. Because there's something wrong with the roadside mirror.

C. Because the other driver drove too fast.

听第九段对话,回答15-17题

15. Where is Miss Smith?

A. She is at home.   B. She is taking a break.   C. She is attending a meeting.

16. When should Miss Smith call today whether she will attend the meeting or not?

A. On Thursday.      B. Today.   C. The day after tomorrow.

17. What number should Miss Smith call?

A. 802 8714 -246.    B. 802 9714 -246.     C. 902 8741-426.

听第十段独白,回答18-20题.

18. Why couldn t the speaker meet with Mr. Smith as soon as he arrived'.'

A. He missed the appointment.  B. He arrived late.   C. He was sick.

19. Why did he give up making a new appointment with Mr. Smith?

A. He couldn't reach Mr. Smith's office.

B. He didn't want to see Mr. Smith any more.

C. He didn't want to take the trouble making it.

20. Whom did he meet on the street one day?

A. A stranger.     B. Mr. Smith.  C. Mr. Smith's secretary.

29、(13分)番茄营养丰富,是人们喜爱的一类果蔬。但普通番茄细胞中含有多聚半乳糖醛酸酶基因,控制细胞产生多聚半乳糖醛酸酶,该酶能破坏细胞壁,使番茄软化,不耐贮藏。为满足人们的生产生活需要,科学家们通过基因工程技术,用土壤农杆菌中的Ti质粒作为运载体,把目的基因重组入Ti质粒上的T-DNA片段中,再将重组的T-DNA插入植物细胞的染色体DNA中。培育出了抗软化、保鲜时间长的番茄新品种。操作流程如图,请回答:

(1)在该操作流程图中用到的生物技术有_________________、_________________

(2)过程①需要的工具酶有__________________________。

(3)在构建基因表达载体时,重组质粒组成中除插入目的基因外(本题中的目的基因是____________),还包括____________、终止子以及______________。

(4)在番茄新品种的培育过程中,将目的基因导入受体细胞的方法叫做______________

(5)从图中可见,mRNAl和mRNA2的结合直接导致了____________无法合成,最终使番茄获得

了      的特性。若上图中番茄是二倍体植株,经分析,该植株含有一个携带此目的基因的T-DNA片段,因此可以把它看作是杂合子。理论上,在该转基因番茄植株自交F1代中,仍具有新特性的植株占总数的    。 多聚半乳糖醛酸酶基因与抗多聚半乳糖醛酸酶基因是否为等位基因?     。

(6)普通番茄细胞导入目的基因后,经[④]______过程形成的组织细胞的特点是_______,然后诱导出试管苗,进一步培养成正常植株。

27、(5分)现有一长度为1400个碱基对的DNA分子,用限制性内切酶KpnI单独酶切后得到560个碱基对和840个碱基对的两种长度的DNA分子,用限制性内切酶EcoRI单独酶切后得到的DNA分子为1400个碱基对,用KpnI和EcoRI同时酶切后得到280个碱基对和840个碱基对的两种长度的DNA分子。

(1)请画出该DNA分子的酶切图谱:例

(2)、如果限制性内切酶EcoRI的识别序列和切点是-G↓GATCC-,在质粒上有限制性内切酶EcoRI的

一个切点,请画出质粒被限制酶Ⅰ切割后所形成的黏性末端。

(2)步骤②一般常用的物理方法是    。诱导形成的D细胞类型有  种。(只考虑2个细胞融合)

(3) 杂种细胞形成的标志是   。在利用杂种细胞培育成为杂种植株的过程中, 运用的技术手段是    。E中细胞在形态、结构和功能上发生稳定性差异的过程叫   

(4)植物体细胞杂交的目的是获得新的杂种植株。使远源杂交亲本的某些遗传特征能够在新的植物体上有所表现,其根本原因      。从理论上讲,杂种植株的育性为     。若运用传统有性杂交方法能否实现?   。因此,这项研究对于培养作物新品种方面的重大意义在于      。

(5)利用植物体细胞杂交的方法培育作物新品种过程中,遗传物质的传递是否遵循孟德尔的遗传规

律?  为什么?    。

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