问题 单项选择题 B型题

复凝聚法制备微囊可用囊材为()

A.明胶

B.丙烯酸树脂RL型

C.β-环糊精

D.聚维酮

E.明胶-阿拉伯胶

答案

参考答案:E

解析:明胶可作微囊的囊材、空胶囊的成囊材料等;丙烯酸树脂RL用作是不溶性固体分散物载体材料;β-环糊精是制备包合物的常用材料;聚维酮为无定形高分子聚合物,易溶于水,为水溶性固体分散物载体材料、片剂的黏合剂等;明胶-阿拉伯胶作为复凝聚法制备微囊的囊材,通过相反电荷相互吸引凝聚成囊。

阅读理解

阅读短文,从每题所给出的(A、B、C、D)四个选项中选出最佳选项。

     Many people have to work on the weekend. Some people do not mind. Other people think it is terrible.

     One man thinks that working on the weekend can be dangerous. He is Graham Coates. Mr. Coates worked

in an office in Brighton, England.

     On Saturday, May 24, 1986, he went to the office to do some work. When he got in the elevator to go home,

it stopped between floors. Mr. Coates could not get out of the elevator. He was trapped (困住了)! He started to

shout, but no one heard him. Then Mr. Coates remembered that it was a holiday in England. No one was going

to come to work until Tuesday!

     There was nothing for Mr. Coates to do. He had to wait until one his coworkers came to work and found

him. With nothing to eat or drink, Mr. Coates ended up sleeping for most of the time. Early on Tuesday morning,

the vice president of the company came into work and found the elevator was not working. When the elevator

was opened, Mr. Coates came out cold, weak, and tired. He had been in the elevator for sixty-two hours!

     Now Mr. Coates says, "I only uses elevators if they have telephones in them."

1. Mr. Coates could not get out of the elevator because ______. [ ]

A. it was broken

B. it was a weekend

C. it was a holiday

D. it stopped on a wrong floor

2. How long did he stay in the elevator? [ ]

A. Twenty-four hours.

B. From Saturday to Monday.

C. More than sixty hours.

D. From Tuesday to Saturday.

3. What did he do in the elevator most of the time? [ ]

A. Shouted and screamed.

B. Slept and waited.

C. Telephoned his boss.

D. Ate and drank.

4. How did he make his way out in the end? [ ]

A. The vice-president found him.

B. Some one opened the elevator.

C. The elevator began to work on Tuesday.

D. He found a door in the elevator.

5. What is the best title for this story? [ ]

A. An Interesting Elevator

B. A Busy Weekend

C. Elevator Safety

D. Trapped in an Elevator

单项选择题