30．John had to have his car repaired in a garage because it　　 seriously.

　　　 A．damaged B．was being damaged C．had damaged D．had been damaged

29．The unemployment rate in this district　　 from 6% to 5% in the past two years.

　　　 A．has fallen　　　　 B．had fallen　　　　 C．is falling　　　　　　 D．was falling

28．Nowadays the roles of husband and wife are not as　　 defined as before, especially when both partners work and earn money for the family.

　　　 A．clear　　　　　　　　 B．clearer　　　　　　　 C．clearly　　　　　　　 D．more clearly

27．The boss has given everyone a special holiday, so we　　 go to work tomorrow.

　　　 A．can’t　　　　　　　　 B．mustn’t 　　　　　　 C．needn’t　　　　　 D．shouldn’t

26．Treat　　 to a glass of wine to help you relax at the end of the day.

　　　 A．one　　　　　　　　　 B．oneself　　　　　　　 C．you 　　　　　　　　 D．yourself

Directions: Beneath each of the following sentences there are four choices marked A, B, C and D．Choose the one answer ~at best completes the sentence.

25．Dolly wants to cycle round the world and she is really keen　　 the idea．

　　　 A．on　　　　　　　　　　 B．for　　　　　　　　　　　 C．at 　　　　　　　　　　 D．with

Part A Short Conversations

Directions: In Part A, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said．The conversations and the questions will be spoken only once.　 After you hear a conversation and the question about it, read the four possible answers on your paper, and decide which one is the best answer to the question you have heard,

1．A．Japan.　　 　　　 B．Italy.　　　 　　　 C．Australia.　 　　 D．Egypt.

2．A．Four times.　　　　 B．Five times.　　　　 C．Ten times.　　　　 D．Fourteen times.

3．A．A journalist.　　　　 B．A novelist.　　　　 C．A sportsman.　　 D．A newsagent.

4．A．To tell him they are busy.　　　　　　　　 B．To cancel an appointment.

　　　 C．To invite him to see a film.　　　　　　 D．To ask him to get film tickets.

5．A．He didn’t understand the lecture. B．Professor Smith misused a word．

　　　 C．He couldn’t find Professor Smith’s class. D．Professor Smith kept the class late.

6．A．She should lose five pounds.　　　　　 B．She can’t gain any more weight.

　　　 C．She should buy some new clothes.　　　　　　　　　　　　　　 D．She needn’t worry about her weight.

7．A．They’re not in the same direction.　 B．He’ll join the woman.

　　　 C．He’s going to Work for IBM.　　　　　 D．He’s going to buy a computer.

8．A．She learned a lot about characters.　　　　　　　　　　　　　　 B．She forgot the title of the book.

　　　 C．She also found the book difficult. D．She also read a book about names.

9．A．He’ll be in both places.　　　　　　　　　 B．He has to change his schedule at once.

　　　 C．He’ll go to the party immediately.　　　　　　　　　　　　　　　 D．He regrets that he can’t go to the party.

10．A．He plans to buy a new MP3. 　　　 B．He doesn’t need his MP3 until Friday.

　　　 C．He can’t wait until Friday for his MP3.　　　　　　　　　　　　 D．He is going to borrow an MP3.

Part B Passages

Directions: In Part B, you will hear two short passages, and you will be asked three questions on each of the passages.　 The passages will be read twice, but the questions will be spoken only once.　 When you hear a question, read the four possible answers on your paper and decide which one would be the best answer to the question you have heard．

Questions 11 through 13 are based on the following passage.

11．A．Relationship with parents.　　　　　　 B．Life in the university.

　　　 C．Experience of sharing fiats.　　　　　 D．Friendship with foreigners.

12．A．The parties were not very enjoyable. 　　　　　　　　　　　　 B．The house was too noisy.

　　　 C．They had no time to clean the bathroom.　　　　　　　　 D．She couldn’t afford the phone bill.

13．A．She doesn’t need to cook every day.　　　　　　　　　　　　 B．She has someone to share feelings.

　　　 C．She can live in a new and quiet place.　　　　　　　　　　 D．She can get up as late as she likes.

Questions 14 through 16 are based on the following news.

14．A．What they take along　　　　　　　　　 B．How they travel safely.

　　　 C．Which travel guide they choose　 D．How t-hey survive overseas.

15．A．Something mysterious.　　　　　　　　　 B．A strange art form.

　　　 C．Something he is good at.　　　　　　　 D．Part of every life.

16．A．Doing experiments.　　　　　　　　　　　　 B．Helping athletes compete in games.

　　　 C．Checking the alcohol level 　　　　 D．Testing the safety of food．

Part C Longer Conversations

Directions: In Part C, you will hear two longer conversations. The conversations will be read twice.　 After you hear each conversation, you are required to fill in the numbered blanks with the information you have heard．Write your answers on your answer sheet.

Blanks 17 through 20 are based on the following conversation.

Complete the form.　 Write ONE WORD for each answer.

Blanks 21 through 24 are based on the following conversation.

Complete the form.　 Write NO MORE THAN THREE WORDS for each answer.

45．(13分)某种野生植物有紫花和白花两种表现型，已知紫花形成的生物化学途径是：

A和a、B和b是分别位于两对染色体上的等位基因，A对a、B对b为显性。

基因型不同的两白花植株杂交，F₁紫花：白花=1：1．若将F₁紫花植株自交，所得F₂植株中紫花：白花=9：7，请回答：

　 (1)从紫花形成的途径可知，紫花性状是由_____________对基因控制。

　 (2)根据F₁紫花植株自交的结果，可以推测F₁紫花植株的基因型是　　　　　　 。

　 (3)紫花形成的生物化学途径中，若中间产物是红色(形成红花)，那么基因型为AaBb的植株自交，子一代植株的表现型及比例为：　　　　　　 。

　 (4)紫花中的紫色物质是一种天然的优质色素，但由于B基因表达的酶较少，紫色物质含量较低。设想通过基因工程技术，采用重组的Ti质粒转移一段DNA进入细胞并且整合到染色体上，以促进B基因在花瓣细胞中的表达，提高紫色物质含量。该过程要用到的工具酶有：_____________，Ti质粒的作用是　　　　　　 。

　 (5)限制性内切酶I的识别序列和切点是-G^↓GATCC一，限制性内切酶II的识别序列和切点是一^↓GATC一。在质粒上有酶I的一个切点，在目的基因的两侧各有1个酶II的切点。

①请画出质粒被限制酶I切割后所形成的黏性末端。

②请画出目的基因两侧被限制酶II切割后所形成的黏性末端。

③在DNA连接酶的作用下，上述两种不同限制酶切割后形成的黏性末端能否连接起来?为什么?

44．(15分)下图表示病菌感染人体后，免疫细胞做出应答的部分过程。请据图回答问题。

　 (1)图中②为___________细胞，④为　　　　　　　　 细胞。

　 (2)⑦与④功能上的区别是___________，由④分化为⑦的过程中，④细胞核内的___________通过核孔进入细胞质，该分子的作用是作为　　　　　 的模板。

　 (3)抗体从在细胞内合成到分泌至细胞外的过程为___________________。

　 (4)过程③表示___________，过程⑤表示　　　　　　　　 　　　　。

　 (5)某人由于细菌感染引发了肺炎，侵入人体的细菌是一种发热激活物，通过一系列反应引起人体发热。体温过高时，人体新陈代谢加快，细胞内葡萄糖氧化分解___________，耗氧量___________；由于供氧不足，肌肉组织中___________含量增高，病人会感觉肌肉酸痛。人的体温是由位于　　　 的　　　　 中枢调控的。

在此例中从发热到体温恢复正常的过程中，人体的___________和___________系统参与了调节，最终实现稳态。

43．(10分)下图表示玉米和小麦两种植物随着光照强度的变化，吸收CO₂和释放CO₂的变化图解。请据图同答：

　 (1)据图分析，　　　　　　　　　 曲线应该表示玉米。

　 (2)当光照强度为Y时，植物细胞中可以产生ATP的结构是　　　　　　　　　　　 。

　 (3)在光照强度为Z时，A植物光合作用产生的葡萄糖为　　　 mg／(m2·h)，此时光合速率基本不再增加，这主要是因为光合作用　　　　　 阶段所产生的　　　　 有限所致。

　 (4)对B植物而言，假如白天和黑夜的时间各为12h，平均光照强度在　　　　　 klux以上才能使CO₂的吸收量超过CO₂的释放量。当平均光照强度在X和Y之间(白天和黑夜的时间各为12h)，A植物一昼夜中有机物总量的变化是___________，B植物一昼夜中有机物总量的变化是___________。

　 (5)在农业生产中，为提高光能利用率可采取的措施有(答两项)

　　　　　　　　 、　　　　　　　　　　　　 。