第一节 听力理解 (共15小题;每小题1.5分,满分22.5分)

每段播放两遍。各段后有几个小题,各段播放前每小题有5秒钟的阅题时间。请根据各段播放内容及其相关小题,在5秒钟内从题中所给的A、B、C项中,选出最佳选项,并在答题卡上将该项涂黑。

听第1段对话,回答第1~3题。

1. What does the woman advise the man to do?

A. Watch a TV play.

B. Go to the cinema.

C. Listen to a radio play.

2. Why doesn’t the man buy a new radio?

A. Because he doesn’t have enough money at present.

B. Because he thinks the old one is as good.

C. Because he doesn’t like a new one.

3. What does the man think of the radio programme?

A. It’s hard to understand.   B. It’s interesting.     C. It’s boring.

听第2段对话,回答第4~6题。

4. What does the man want to do?

A. Buy a package.

B. Visit Union Express.

C. Send something back home.

5. Where will the package be picked up from?

A. From the Company “Union Express”.

B. From University of Glasgow.

C. From the post office.

6. What’s the man’s response to the charge?

A. He accepts it.

B. He has to think about it.

C. He thinks it’s too expensive.

听第3段对话,回答第7~9题。

7. When will the man go to San Francisco?

A. At 2: 30 p.m., Feb. 18.

B. At 6: 00 p.m., Feb. 20.

C. At 6: 00 p.m., Feb. 18.

8. Why does the man cancel his ticket?

A. Because the flight is delayed.

B. Because there is not flight on 18th.

C. Because he has changed his plans.

9. Where will the man get back the refund(退款)?

A. At the travel agency.

B. Where he bought the ticket.

C. At New York Airport.

听第4段独白,回答第10~12题。

10. When can they talk to the teachers?

A. When the teachers are not busy.

B. When school is over.

C. When they sit in the classes.

11. What can they do during the visit?

A. They may talk to the students in Chinese.

B. They can take photos of the students.

C. They may teach the pupils some Chinese.

12. Why should they follow the programme set up by the schools?

A. Because the schools in UK are very strict.

B. Because the teachers in UK are very busy.

C. Because there are too many visitors.

听第5段对话,回答第13~15题。

13. Where does this news programme take place?

A. At a shopping center.

B. At a local school.

C. At the door of the woman.

14. What does the woman and her family eat on this day?

A. Turkey.      B. Food from Turkey.     C. Chicken.

15. What does the woman think of Christmas?

A. It’s a time when people exchange gifts with friends.

B. It’s a holiday when family members give gifts during a dinner.

C. It’s a day when people think of others without waiting for a gift in return.

37.(10分)微核由染色体的断片或整条染色体形成,是真核细胞中的一种异常结构,呈圆形或椭圆形,游离于主核之外。微核往往由于细胞受辐射或化学药物的作用而产生,“微核检测”可用于了解化学物质的遗传毒性。

某中学研究性学习小组的同学为了了解厨房油烟能否诱导微核,采集了某家庭40天中厨房抽油烟机内积累的油烟冷凝物,用二甲基亚砜溶解后再用蒸馏水稀释,配制了一系列浓度的油烟冷凝物溶液,各取等量加入烧杯A、B、C、D中;另取等量二甲基亚砜和蒸馏水加入烧杯E,取等量蒸馏水加入烧杯F。之后,将6个大小和生长状况相同、幼根已培养至1 cm的洋葱,分别置于上述6种溶液中培养24h,然后再将洋葱转移到蒸馏水中继续培养24h。24h后从每个洋葱上随机取4条根尖并按常规方法制作临时装片,在显微镜下观察每个装片上的1000个根尖细胞,计算其中出现微核的细胞数目(微核的千分率),结果如下表所示。

        项  目
组  别
项目1
细胞微核率(‰)
项目2
A
50μg/ mL
12.54
13.50
11.72
13.00
 
B
100μg/ mL
15.92
15.00
14.85
14.91
 
C
200μg/ mL
18.68
16.22
17.00
18.00
 
D
300μg/ mL
20.00
20.20
20.00
18. 69
 
E
二甲基亚砜加蒸馏水
3.77
3.85
4.00
3.87
 
F
蒸馏水
3.43
3.60
3.64
4.00
 

请分析回答:

(1)为什么将洋葱根尖在上述各种溶液中培养24 h?              。镜检的细胞应该位于根尖      区而且处在细胞分裂     期。 

(2)研究性学习小组的同学在取得洋葱根尖后,按“常规方法”制作装片,这种常规方法的操作步骤可简略表示为                           。

(3)表中的项目2应该是              。

(4)对A-D组而言,E组和F组中,哪一组是对照组?       。将E组和F组进行比较,能说明                             。

(5)该实验可得出什么结论?                           。

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