第二节(共15小题;第小题1.5分,满分22.5分)请听下面5段对话或独白,选出最佳选项。请听第6段材料,回答第6至8题。

6.What does the woman show the man?

  A.Pictures.    B.Postcards.    C.Stamps.

7.Where did the woman get the things she shows the man?

  A.At the Summer Palace.      B.At the Forbidden City.

C.A t the Great Wall.

8.What did the woman do in China?

  A.She learned a lot of Chinese.    B.She made some great Chinese friends.

C.She learned how to cook C                                              hinese food.

请听第7段材料,回答第9至11题。

9.When does the conversation probably take place?

  A.Before the play.    B.During the play.   C.After the play.

10.Which of the following is TRUE about the play?

  A. The heroine’s name is Ann Merriweather.

B.It’s a comedy about three sisters.

C.One teacher falls in love with her colleague.

11.What can we learn from the conversation?

  A.Neither the man nor the woman has seen the play before.

B.The man bought the woman one ticket for the play.

C.The woman is not familiar with the plot of the play.

请听第8段材料,回答第12至14题。

12.What did the woman use to be?

  A.A film star.    B.A singer.    C.A tennis player.

13.How does the woman feel about New York?

  A.New York hasn’t had any changes at all.

B.Changes have taken place round the center.

C.The countryside has some differences from the downtown area.

14.Why does the woman come to New York?

  A.To star in a TV program.

B.To attend or watch the tennis games.

C.To spend a vacation.

请听第9段材料,回答第15至17题。

15.What can we know about the shirt the woman first recommends?

  A.It’s a white shirt.

B.Its size is thirty-one.

C.It costs 5.59 dollars.

16.What did the man buy in the shop yesterday?

  A.A handkerchief    B.A tie    C.A pair of socks

17.What is the man’s total bill?

  A.3.95 dollars.   B.4.50 dollars   C.4.60 dollars.

请听第10段材料,回答第18至20题。

18.What did the speaker’s friends think of his change of interest?

  A.Understandable    B.Strange.   C.Crazy.

19.Why did the speaker change his interest to underwater exploration?

  A.It is much cheaper than space travel.

B.It is much safer than space travel.

C.It is more exciting than space travel.

20.In what way does the speaker think the ocean is similar to space?

  A.They are both easy to explore.

B.They are both beautiful.

C.They are both awful.

30. (30分)

Ⅰ.(18分)某实验室做了下图所示的实验研究,已知小鼠体细胞的染色体数目为40条。分析回答下列问题:

(1)与纤维母细胞相比,过程①形成的诱导干细胞的全能性        。

(2)过程②是       过程,其根本原因是             。

(3)要获得Y细胞,将H1N1病毒外壳蛋白质注射到小鼠体内,实质是在小鼠体内引发

      过程,Y细胞一般是从小鼠        中采集的。

(4)过程③除了采用诱导植物细胞原生质体融合的方法外,还可以用       诱导。

(5)产生单抗Z细胞叫          ,它从培养液中吸收氨基酸的方式和分泌单抗到细胞外的方式      (相同/不同)。

(6)培养中的Z细胞最多含有      条染色体。

Ⅱ.(12分)细胞周期包括分裂间期(分期G1、S期和G2期)和分裂期(M期)。下图标注了甲动物(体细胞染色体数为12条)肠上皮细胞的细胞周期各阶段的时长及DNA含量。请回答下列问题:

(1)若用含放射性同位素的胸苷(DNA复制的原料之一)短期培养甲动物肠上皮细胞后,处于S期的细胞都会被标记。洗脱含放射性同位素的胸苷,换用无放射性的新鲜培养液培养,定期检测。预计最快约    h后会检测到被标记的M期细胞。

(2)从被标记的M期细胞开始出现到其所占M期细胞总数的比例达到最大值时,所经历的时间为     期的时间(填图中字母),处于该期的一个细胞中染色体数目的变化情况是        

(3)若向甲动物肠上皮细胞培养液中加人过量胸苷,处于S期的细胞立刻被抑制,而处于其他时期的细胞不受影响。预计加人过量胸苷约     h后,细胞都将停留在S期。

(4)乙动物肠上皮细胞的细胞周期时长为24h,M期时长为l.9h。若要在显徽镜下观察细胞有丝分裂过程中染色体形态的变化,选用     (填“甲”或“乙”)动物肠上皮细胞更合适。

(5)在光学显徽镜下观察,同处于分裂末期的动物肠上皮细胞与洋葱根尖细胞,形态上最主要的区别是                            

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