问题 问答题 简答题

配气机构功用。

答案

参考答案:

是按照发动机的工作顺序和工作循环的要求,定时开启和关闭各缸的进、排气门,使新气进入气缸,废气从气缸排出。

阅读理解

阅读理解。

     More and more people like bicycling and it is no surprise. It is fun ,healthy and good for the 

environment. Maybe that 't why there are l.4 billion bicycles  and only 400 million cars on roads 

worldwide today. Bikes can take you almost anywhere, and there is no oil cost!   

     Get on a bicycle and ride around your neigh b our hood. You may discover something new all 

around you. Stopping and getting off a bike is easier  than stopping and getting out of your car. You

 can bike to work and benefit(受益) from the enjoyable exercise without polluting the environment. 

You don't even have to ride all the way.    

     Folding (折叠) bikes work well for people who  ride the train. Just fold the bike and take it with you. 

You can do the same on an airplane. A folding bike can be packed in a suitcase.    

     You can also take a common bike with you  when you fly. But be sure to look for information by

 getting on airline websites.     

      Not all airlines are bicycle-friendly to travelers.     

      Health Benefits of Bicycling:   

      ●It helps to prevent heart diseases.   

      ●Bicycling helps to control your weight.

      A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.   

      ●Bicycling can improve your mood(心情).         

      Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.  

      ●Bicycling is healthier than driving.

1. From the passage, we know that bicycling is be-coming very_____.  

A. surprising        

B. exciting

C. expensive        

D. popular

2. When you are riding your bicycle around your  neigh our hood, you may _____.   

A. pollute the environment around

B. find something you didn't notice

C. go everywhere and use a little oil

D. get off your bike and begin to work

3. If you travel with a folding bike, you can fold it and  _____.    

A. get out of the car    

B. take it onto a train

C. put it in your purse    

D. go on airline websites

4.One of the benefits from bicycling is that   

A. you can fold the bicycle

B. you will be friendly to others

C. you will be more relaxed

D. you may get fatter and fatter

5. Which is TRUE according to the passage?

A. Bicycling is enjoyable exercise for people.

B. Driving cars is healthier than riding bikes.

C. Riding a bike pollutes your neighbourhood.

阅读理解

The teacher who did the most to encourage me was, as it happened, my aunt. She was Myrtle C. Manigault, the wife of my mother’s brother Bill. She taught in second grade at all-black Summer School in Camden, New Jersey.

During my childhood and youth, Aunt Myrtle encouraged me to develop every aspect of my potential, without regard for what was considered practical or possible for black females. I liked to sing; she listened to my voice and pronounced it good. I couldn’t dance; she taught me the basic dancing steps. She took me to the theatre ---- not just children’s theatre but adult comedies and dramas—and her faith that I could appreciate adult plays was not disappointed.

My aunt also took down books from her extensive library and shared them with me. I had books at home, but they were all serious classics. Even as a child I had a strong liking for humor, and I’ll never forget the joy of discovering Don Marquis’s Archy & Mehitabel through her.

Most important, perhaps, Aunt Myrtle provided my first opportunity to write for publication. A writer herself for one of the black newspapers, she suggested my name to the editor as a “youth columnist”. My column, begun when I was fourteen, was supposed to cover teenage social activities—and it did—but it also gave me the freedom to write on many other subjects as well as the habit of gathering material, the discipline of meeting deadlines, and, after graduation from college six years later, a solid collection of published material that carried my name and was my passport to a series of writing jobs.

Today Aunt Myrtle is still an enthusiastic supporter of her “favourite niece”. Like a diamond, she has reflected a bright, multifaceted (多面的) image of possibilities to every pupil who has crossed her path.

小题1:Which of the following did Aunt Myrtle do to the author during her childhood and youth?

A.She lent her some serious classics.

B.She cultivated her taste for music.

C.She discovered her talent for dancing.

D.She introduced her to adult plays.小题2:Aunt Myrtle recommended the author to a newspaper editor mainly to ______.

A.involve her in teenage social activities

B.give her a chance to collect material

C.develop her capabilities for writing

D.offer her a series of writing jobs小题3:We can conclude from the passage that Aunt Myrtle was a teacher who ______.

A.gave pupils confidence in exploiting their potential

B.trained pupils to be diligent and well-disciplined

C.emphasized what was practical or possible for pupils.

D.helped pupils overcome difficulties in learning