治疗肾癌最主要的治疗方法是（） A.肾部分切除术 B.单纯性肾切除术 C.根治性肾切

阅读理解。

根据下面短文内容，选择正确答案。

     Miss White was going to give a lecture on Friday afternoon, but on

Thursday night she was told that she had to go to an important meeting the

next day at the same time. " No one can be in two places at the same time.

What shall I do?" She thought. But soon , she had an idea.    

     At five to three on Friday afternoon Miss White went to the lecture

room. There were twenty students waiting there for her. "I’m sorry. '' She

told them, "I won’t be able to give my lecture today. " The students looked

surprised. Miss White explained that she had an important  meeting."

However, "she went on. "though I can't be with you myself, my voice can. "

Then she put a small tape recorder on the desk, "you see，I've recorded my

lecture and you can listen to it without me."

     Miss White turned on the recorder and left.    The meeting ended a little

earlier. Miss White decided to go back to her students. She stood for a

moment outside the lecture room, listening to her own voice. Then quickly,

she opened the door. To her surprise, the room was empty.  As she looked

around，she saw a number of small recorders-all " listen " to her lecture!    

     " Well," she thought, " if I can be in two places at the same time, why

can't they?"

1. Miss White had to ____ on Friday afternoon.          

      A. give a lecture          

      B. attend a meeting          

      C. both A and B          

      D. think of an idea

2. The students ____ to know Miss White

     wouldn't give the lecture.          

      A. were so excited          

      B. were surprised           

      C. left the lecture room quickly          

      D. were disappointed

3. Miss White recorded her lecture so that ____ 

    while she was away.           

      A. the students could do the same          

      B. the students could teach themselves          

      C. her voice could be with her          

      D. the students could listen to it

4. When she returned from the meeting, Miss White

      found ____ her lecture.          

      A. no one in the lecture room listening to          

      B. every student recording          

      C. only few students listening to          

      D. all her students listening to

5. Miss White thought it was _____ .          

      A. all right for her students to do the same as she did          

      B. wrong for her students to be absent(缺席) from the lecture.          

      C. clever of her students to record her lecture          

      D. kind of her students to leave so many recorders

下面不属于使用视图的优点的是

A．分散用户的数据

B．降低数据库的复杂性

C．组织数据转移到其他应用程序

D．简化数据库的管理

下列几种物质中互为同分异构体的是（ ）

A．水和重水

B．氧气和臭氧

C．2—甲基丁烷和新戊烷

D．氘和氚

合同审查分为两种形式即（）和（）。

套利