问题 单项选择题

有关噬菌体载体的描述中,错误的是()

A.M13和粘粒在应用中非常常见

B.M13属于单链丝状噬菌体载体

C.野生型λ噬菌体载体的基因组为线形双链DNA

D.野生型λ噬菌体载体在外界重组DNA进入时,不必两条DNA链完全相同才可以组装成成熟颗粒

E.SV40载体属于噬菌体载体

答案

参考答案:E

阅读理解

阅读理解。

     Many people have the wrong idea about pigs. Pigs are actually very clean animals. On farms, they live

 in dirty places. So, they become very dirty. In the world, pigs keep very clean.

     They are also really smart. They may be smarter than dogs. So, pigs can learn things from people.

     Pigs are very friendly animals. Some people raise them as pets. Of course, people raise the small kind, 

 not the big kind. Small pigs are very cute. And they don't break things in the house. Big pigs ususlly live

 outside on farms, not in people's houses.

1. Which words can describe pigs?

    A. Dirty and stupid.            

    B. Nervouse and strange.        

    C. Dangerous and unfriendly    

    D. Intelligent and friendly.        

2. What does in the wild mean?

    A. In nature.                  

    B. On farms.        

    C. Acting crazy.                

    D. In people's houses.

3. Which of the following is true?

    A. Pigs like to be dirty.          

    B. People can teach pigs things.      

    C. Dogs are smarter than pigs.      

    D. Only farmers raise pigs.

4. What kind of pigs do people raise in their houses?

    A. The very big kind            

    B. The small kind.

    C. The kind from farms.        

    D. The ugly kind.

5. The article doed NOT discuss _____.

    A. pigs as pets              

    B. pigs on farms and in the wild        

    C. raising dogs              

    D. people's wrong ideas about pigs

单项选择题