9．How could the man get in touch with Mr. Green?

     A．Ask the woman to find the Blackwood Hotel.

8．What can the woman be?

       A．A waitress at a hotel

     B．The secretary of Mr. Black

     C．The assistant of Professor Green.

7．What could be the reason if the woman does not buy the overcoat?

     A．The color.              B．The size.                 C．The price.

       请听第7段材料，回答第8―10题

6．In which department can this conversation most probably take place?

       A．Shoe Department.     B.ClothingDepartment.    C．Jewelry Department.

5．Why doesn’t she like chocolate cake?

   A．She doesn’t like chocolate.

   B．She has trouble with her tooth.

C．She has no tooth.

第二节：                            

请听第6段材料，回答第6-7题。

4．Where does the conversation take place?

   A．In the bookstore.      B．In the library.           C．In the classroom.

3．What does the woman mean?

   A．Mark should go on with the game.

   B．Mark should draw pictures on the computer.

   C．Mark should review his lessons.

2．How does the woman find the fish?

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

1．What are the two speakers going to buy?

       A．Bread．                B．Cheese.                 C．Eggs.

（4）可以利用____________________________的原理鉴定细胞中DNA存在的部位。

列问题:

（1）鉴定是否用淀粉冒充，可用的具体操作方法是：­­­­­­­­­­­­­­­­­­­­­­­­­­                       

（2）鉴定是否用全脂奶粉冒充的操作方法是：                               

（3）结果分析：                                                        

（4）通过以上鉴定，我们并不能完全肯定该样品是否为正宗的脱脂奶粉，还必须对其______________含量鉴定。

附加题：（5分）

已知胰岛素分子的结构式如下：其中A链有氨基酸残基21个，B链有氨基酸残基30个，两条肽链通过两个二硫键的连接，A链上形成一个二硫键（两个―SH形成―S―S―），计算求胰岛素分子与51个氨基酸的分子质量相比减少了多少。