第二节(共12小题,每小题1.5分,满分18分)

听下面4段对话,每段对话后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。每段对话读两遍。

听下面一段材料,回答第6-8题。

6. What is the woman planning to do this evening?

  A. Have a talk with Bob.               B. See some Americans off.

  C. Have dinner with some American friends.

7. What’s wrong with the man?

  A. He’s got a headache.               B. He’s forgotten the date. 

C. He’s forgotten to take some medicine.

8. Who is the man going to write to?

  A. His friends.         B. His parents.     C. His brother.

听下面一段材料,回答第9-11题。

9. What does the man ask the woman to do on Sunday afternoon?

  A. Meet his friends.    B. Watch a volleyball game.  C. Come to a dinner party.

10. What will the woman do on Sunday afternoon?

  A. Invite some friends.   B. Go to Mexico City.    C. Pick up her brother-in-law.

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

A.    Come over after getting back from the airport.

B.    Bring something to eat.             C. Order pizza for dinner.

听下面一段材料,回答第12-14题。

12. How did the woman know about the man’s wonderful performances?

  A. By watching TV.    B. From the radio.      C. By reading the newspaper.

13. What can we learn about the man?

A. He has traveled a lot.   B. He’s ill.         C. He has a lot of money.

14. What is the man planning to do?

  A. Play with disabled children.  B. Run a special school.  C. Improve his playing skills.

听下面一段材料,回答第15-17题。

15. When does the conversation probably take place?

  A. In the morning.      B. At noon.        C. In the afternoon.

16. Where did the woman go first?

  A. The police station.     B. A restaurant.       C. A shop.

17. Who does the man suggest the woman phone?

  A. The woman’s friend.               B. The manager of the shop.

  C. The manager of the restaurant.

2.显色剂:0.1%水和茚三酮溶液

若该同学想证明混合液确实含有上述5种氨基酸,请利用题给条件设计试验:

1)实验原理:

A.除脯氨酸,羟脯氨酸和茚三酮反应产生黄色物质外,所用a-氨基酸和一切蛋白质都能和茚三酮反应生成蓝紫色物质。

B.在一定条件下,                               

                                 。

2)实验步骤:

①取层析滤纸一张,剪成20厘米长,14厘米宽的滤纸条,在纸的一端距边缘2-3厘米处用铅笔画一条直线,再此直线上每间隔2厘米作一记号,共需作    处记号.

                                      

                          

③将处理好的滤纸条卷成筒状用U形扣固定,放入加好了扩展剂的层析缸中,待扩展剂上升到一定阶段时取出滤纸,自然风干。本步骤的注意事项是:           

                           

                                      

                                .

3)请在下图中绘出滤纸条上的预期结果:(已知扩散速度为赖氨酸<脯氨酸<缬氨酸<苯丙氨酸<亮氨酸)

 0  394600  394608  394614  394618  394624  394626  394630  394636  394638  394644  394650  394654  394656  394660  394666  394668  394674  394678  394680  394684  394686  394690  394692  394694  394695  394696  394698  394699  394700  394702  394704  394708  394710  394714  394716  394720  394726  394728  394734  394738  394740  394744  394750  394756  394758  394764  394768  394770  394776  394780  394786  394794  447090 

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