问题 单项选择题 A1/A2型题

5%硫喷妥钠10ml加入5%葡萄糖注射液500ml中产生沉淀,主要是因为()

A.注射液溶媒组成改变

B.电解质盐析作用

C.pH改变

D.直接反应

E.水解反应

答案

参考答案:C

单项选择题 A1/A2型题
阅读理解

     I was walking along the main street of a small seaside town in the north of England looking for

somewhere to make a phone call. My car had broken down outside the town and I wanted to contact

the AA Company. Low grey clouds were gathering across the sky and there was a cold damp wind

blowing off the sea which nearly threw me off my feet every time I crossed one of the side streets. It had

rained in the night and water was dripping from the bare trees that lined the street. I was glad that I was

wearing a thick coat.

     There was no sign of a call box, nor was there anyone at that early hour whom I could ask. I had

thought I might find a shop open selling the Sunday papers or a milkman doing his rounds, but the town

was completely dead. The only living thing I saw was a thin frightened cat outside a small restaurant.

     Then suddenly I found what I was looking for. There was a small post office, and almost hidden from

sight in a dark narrow street. Next to it was the town' s only public call box, which badly needed a coat

of paint. I hurried forward, but stopped in astonishment when I saw through the dirty glass that there was

a man inside. He was fat, and was wearing a cheap blue plastic raincoat. I could not see his face and he

did not even raise his head at the sound of my footsteps.

      Carefully, I remained standing a few feet away and lit a cigarette to wait for my turn.  It was when I

threw the dead match on the ground that I noticed something bright red trickling from under the call box

door.

1. At what time was the story set? 

A. An early winter morning.    

B. A cold winter afternoon.

C. An early summer morning.    

D. A windy summer afternoon.

2. Which of the following words best describe the writer's impression of the town?   

A. Cold and frightening.    

B. Dirty and crowded.

C. Empty and dead.        

D. Unusual and unpleasant.

3. The underlined word "trickling" in the last paragraph probably means ______.   

A. rushing out suddenly    

B. shining brightly

C. flowing slowly in drops  

D. appearing slowly

4. Why didn't the man raise his head when the writer came near?  

A. He was annoyed at being seen by the writer.

B. He was angry at being disturbed by the writer.

C. He was probably fast asleep.

D. He was probably murdered.