问题 单项选择题

叉车的转向传动机构一般采用()机构。

A.单梯形

B.三角形

C.平行四边形

D.双梯形

答案

参考答案:D

阅读理解

阅读理解。

     In today's world,almost everyone knows air pollution and water pollution. But not all the persons know that noise is also a kind of pollution. In fact,noise pollution is harmful to human health,too.

     People usually have poorer hearing if they work and live under noisy conditions. Recently many teenagers in America can hear no better than 65-year-old people,for these people like to listen to pop music and most of the music is a kind of noise. Many people living near airports become deaf. Noise produced by

jet-planes or machines will make people's life difficult and unpleasant,or even make people ill,or even drive them mad.

     Nowadays the governments of many countries are trying to solve not only air and water pollution

problems but also noise pollution problems.

1.     __   is a kind of pollution.

A. Water                              

B. Air

C. Noise                              

D. Pop music

2.      __ usually have poor hearing.

A. People listening to pop music

B. People living near airports

C. People working in the street

D. People living in foreign countries

3. The governments of many countries are trying to solve   __    .

A. water pollution                  

B. air pollution

C. noise pollution                  

D. all of the above

4. Many people living near airports become deaf,because of  __     .

A. air pollution                    

B. water pollution

C. noise pollution                 

D. music pollution        

5. Many teenagers like to listen to   __    .

A. noise                        

B. pop music

C. classical music                  

D. jazz

判断题