9. What will Mary do at the party?

A. She will sing some Chinese songs.　　　　 B. She will sing some English songs.

C. She will be the hostess at the party.　

Conversation 5:

W: Dad, can you lend Jenny and me some money?

M: For what?

W: We want to get tickets for a rock concert. We’ll pay you back out of baby-sitting.

M: How much are these tickets?

W: Eighteen dollars each.

M: Eighteen dollars? That’s a lot of money.

W: That’s not very much for this band, Dad. They are great singers, very popular.

M: When will you need the money?

W: Bob is also going and he’s going to town tomorrow to get the tickets.

M: All right. Here’s a fifty.

W: Thanks a lot, Dad. I’ll call Bob right now.

8. What will the classroom turn into?

A. A bedroom.　　　 B. A dance hall.　　　　　　　　　 C. A dining hall.

7. What is the probable relationship between the two speakers?

A. Friends.　　　　　 B. Teachers and students.　　　　　 C. relatives.

6. What does the woman think of the school?

A. Very good.　　　　　 B. Just so-so.　　　　　　　 C. Bad.

Conversation 4:

M: Mary, we are going to have a party on New Year’s Eve. I’m sure we’ll have a good time. Would you like to join us?

W: I’d like to. Where are you going to have it?

M: In our classroom. We are going to decorate it and turn it into a splendid ballroom.

W: Oh, it is great. I shall be very glad to spend my first New Year in China with you.

M: But we are going to ask everyone at the party to give a performance. Do sing us some English songs, please.

W: I will. My voice is not very pleasant to the ear, though.

M: I heard you sing once. Your voice was sweet and beautiful. I’m sure you’ll be the star of our New Year party.

W: Oh, thank you.

5. What are the speakers?

A. Teachers.　　　　　　　　 B. Students.　　　 C. Parents.

4. What are they going there for?

A. To go outing.　　　 B. To see Beijing Opera.　　　　　 C. To learn Beijing Opera.

Conversation 3:

M: I think I was very lucky to enter this school. But it lies in the suburb.

W: Ah, this is a developing area. There will be a lot more people here in about five years' time. And there won't be many factories.

M: Yes. We can breathe fresh air every day. What do you think of the teachers here?

W: Very good and kind. They are helpful. I am making progress.

W: I hope I can get used to the life here soon.

3. Where are they going at the weekend?

A. Beijing Theater.　　　　 B. Beihai Park.　　　　　　　 C. ChaoYang Park.

2. Whom did the man chat with?

A. People from America.　　　　 B. People who are watching a movie. 　　

C. People in different countries.

Conversation 2:

M: Susan, Please pass me a copy of Beijing Review.

W: Here you are.

M: I want to find what’s on this weekend.

W: Is there anything good on?

M: The Beijing Opera is showing on Saturday evening. Do you like Beijing Opera?

W: Oh, yes. Very much. When and where will it be?

M: At 7:30 in ChaoYang Park.

W: Let's go and see it, OK?

M: Good idea!

30.(8)下面是对大肠杆菌进行数量测定的实验，请回答有关问题。

　　 (1)制备稀释倍数为10²、10³、10⁴、10⁵、10⁶的系列稀释液。

　　 (2)为了得到更加准确的结果，选用适宜的方法接种样品：右图是利用　　　　　　　 法进行微生物

接种，把聚集的菌种逐步稀释分散到培养基的表面，

为达到这一目的，操作上应注意　　　　　　　

　　　　　　　　　　　　　　 ___________。

(3)适宜温度下培养。结果分析：　　

　　 ①一同学在稀释倍数为10⁵的培养基中测得平板上菌落数的平均值为32．4个，那么每毫升样品中的细菌数是(接种时所用稀释液的体积为0．1mL)　　　　　　　　 个。

②用这种方法测得的数量比实际活菌数量要　　　　　 ，因为　　　　　　　　　　　

　　　　　　　　　　　　　　　　　　　　　　　 。

(4)在微生物培养操作过程中，为防止杂菌污染，操作者的双手需要进行清洗和______ ；已灭菌的材料用具应避免　　　　　　　　　　 。

(5)培养大肠杆菌时，在接种前需要检测培养基是否被污染。对于固体培养基应采用的检测方法是______　　　　　　　　　　　　　　　　　　　　　　　　　　　　 ___。

29．(7分)下图为细胞融合的简略过程，据图回答相关问题。

(1)若a、b分别是基因型为Hhrr、hhRr两个烟草品种的花粉，且这两对基因分别位于两对同源染色体上。由于一对隐性纯合基因(rr或hh)的作用，在光照强度大于800lx时都不能生长。要想从融合细胞的培养液中分离出基因型为HhRr的杂种细胞，较为简便的筛选方法是　　　　　　　　　　　　　　　　 。

　 (2)若a、b表示两种植物体细胞，则由d细胞形成杂种植株的原理是　　　　　　 　，这种育种方法的优点是　　　　　　　　　　　　 。

　 (3)若a、b分别为骨髓瘤细胞和B淋巴细胞，则d细胞特点是　　　　　　　　　　

　　　　　　　 。由d细胞产生的抗体与普通血清抗体相比较，具有　　　　　　　　　

的特点。生产上一般不能通过直接培养B淋巴细胞的方法生产单克隆抗体的主要原因是　　　

　　　　　　　　　　　　　　　　 。

(4)下列各图表示单克隆抗体制备过程的各阶段图解，请用箭头把代表各图解的字母按单克隆抗体制备过程的顺序连接起来。顺序是