问题 推断题

含有氨基(-NH2)的化合物通常能够与盐酸反应,生成盐酸盐。如:R-NH2+HCl →R-NH2·HCl (R代表烷基、苯基等) 现有两种化合物A和B,它们互为同分异构体。已知:

①它们都是对位二取代苯;

②它们的相对分子质量都是137;

③A既能被NaOH溶液中和,又可以跟盐酸成盐,但不能与FeCl3溶液发生显色反应;B既不能被NaOH溶液中和,也不能跟盐酸成盐;

④它们的组成元素只可能是C、H、O、N、Cl中的几种。

请按要求填空:

(1)A和B的分子式是___________。

(2)A的结构简式是___________;B的结构简式是___________。

答案

(1)C7H7NO2(或写成C7H7O2N)

(2)

阅读理解

阅读理解。

     Some time ago, I discovered that one of my chairs had a broken leg. I didn't think there would be

any difficulty in getting it mended, as there are a whole lot of antique (古董) shops near my home. So

I left home one morning carrying the chair with me. I went into the first shop expecting a friendly

reception (接待). I was quite wrong. The man wouldn't even look at my chair.

     The second shop, though slightly more polite, was just the same, and the third and the fourth-so I

decided that my way must be wrong.  

     I went into the fifth shop with a plan in my mind. I placed the chair on the floor and said to the

shopkeeper, "Would you like to buy a chair?" He looked it over carefully and said, "Yes, not a bad chair.

How much do you want for it, sir?" "Twenty pounds," I said. "OK," he said, "I'll give you twenty pounds."

"It's got a slightly broken leg," I said. "Yes, I saw that, it's nothing."  

     Everything was going according to plan and I was getting excited. "What will you do with it?" I asked.

"Oh, it will be easy to sell once the repair is done." "I'll buy it," I said. "What do you mean? You've just

sold it to me," he said. "Yes, I know but I've changed my mind. I'm sorry, I'll give you twenty-seven

pounds for it." "You must be crazy," he said. Then, suddenly the penny dropped. "I know what you want.

You want me to repair your chair." "You're right," I said. And what would you have done if I had walked

in and said, "Would you mend this chair for me?" "I wouldn't have agreed to do it," he said. "We don't do

repairs, not enough money in it and too much trouble. But I'll mend this for you, shall we say for a fiver?"

He was a very nice man and was greatly amuse (感到有趣) by the whole thing.

1. We can learn from the text that in the first shop the writer _____.  [ ]

A. was rather impolite 

B. was warmly received 

C. asked the shopkeeper to buy his chair 

D. asked the shopkeeper to repair his chair

2. The expression "the penny dropped" in the last paragraph means the shopkeeper _____.  [ ]

A. changed his mind       

B. accepted the offer

C. saw the writer's purpose     

D. decided to help the writer

3. How much did the writer pay? [ ]

A. £5.    

B. £7.    

C. £20.    

D. £27.

4. From the text, we can learn that the writer was _____.[ ]

A. honest   

B. clever  

C. careful    

D. funny

单项选择题