问题 选择题

某有机物的结构如图,有关它的说法正确的是

A.分子式为C8H10NO2

B.与Br2 1:1加成最多可得2种产物

C.1mol该有机物最多能与3mol H2发生加成反应

D.它的同分异构体中既属于芳香族化合物又属于α-氨基酸的只有1种

答案

答案:D

该有机物的分子式为C8H9NO2,其中的两个碳碳双键是共轭结构,故与Br2 1:1加成时可发生1,2加成或1,4加成,故可得到三种加成产物;分子结构除两个碳碳双键可与溴加成外,肽键并不能与溴加成,故1mol该有机物最多能与2mol H2发生加成反应。

它的同分异构体中既属于芳香族化合物又属于α-氨基酸的为:

故答案为D

阅读理解

阅读理解

     Dr. Julie Coulton, a British psychologist, focuses her research on the extraordinary function of the

play in the physical and spiritual development of children and Martti Bergson from the University of

Helsinki shows that playing outside, in the open air, contributes to a better development of the brain.

     Thus parents must encourage their children to spend as much time as possible in the open air, and

at the same time, to ask schools and kindergartens to assure the small a playground outside. Recent

statistics (数据) and studies show an alarming increase of the number of hours spent by children in

front of the TV and the computer and a decrease of the time spent outside.

     As a consequence more and more children suffer from eye problems and have to wear glasses.

Also the problem of fatness among children concerns many parents who don't know what to do

anymore to make their children eat healthy and balanced.

     Children need a space where to develop their creativity mid parents should encourage them all the

time. Too many rules hold back the child's personality and creativity and prevent them to develop the

desire to know, to find out, to learn.

     If you tell your child so many times: "Don't do that, don't mess the room, don't go there ...", he

will lose the desire to do something, anything. Parents must watch their children without suffocating

(窒息) them. Should you consider they mustn't do that or this, you have to logically explain them your

reasons and they will understand.

     Through playing a child learns how to communicate, how to take decisions. Playing is connected

to the intellectual, emotional and social progress of the child. Playing lets your children learn how to

express his feelings.

1. What is worrying the scientists is that ______.

A. most parents pay no attention to their children's playing

B. most schools and kindergartens have no playgrounds

C. most parents encourage their children to watch TV or go surfing

D. most children spend more time on TV or tile Internet than on playing outside

2. Children who watch TV or surf the Internet too much may suffer all the following EXCEPT ______.

A. eye problems  

B. weight problems  

C. lack of creativity  

D. lack of interest in their lessons

3. The author advises us ______.

A. to allow children to do whatever we want them to do

B. never to forbid children to do anything they want to do

C. to explain why when you don't let children do something

D. to watch children playing anytime to ensure their safety

4. Which would be a best title for this passage?

A. How to develop the brain of your children better  

B. Playing is good for your children in many aspects

C. Teaching your children what and how to play      

D. Don't forbid your children to do anything

单项选择题 A1/A2型题