题目内容
Without the atmosphere there would be no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the bottom of a great ocean of air. It is invisible, but we can feel it when it moves. There are miles of air above us, pressing down with great weight on the earth and everything on it. Because air presses down on us from all directions at the same time, and because we are able to bear (忍受) this weight, we do not seem to feel it. But scientists have proved that air has this weight, and that anything that has weight creates(产生) a force called pressure. As changes in air pressure take place, they, make air move.
Air is a gas that expands(膨胀) when heated, gets lighter, and moves upward. When air is cooled, it gets heavier, sinks close to the earth's surface, and flows like water in a great river. As warn air rises, cold air rushes in to take its place. 'Thus winds originate (起源). The winds that blow high above us are caused by the warmer air running away from colder air. The wind we feel near the earth's surface is the heavy colder air trying hard to catch the warmer air. Changes in temperature cause the air to move. And of course there are many changes, so air movements are taking place practically all the time.
The first paragraph mainly tells us the causes of
A.why we don't feel air B.why atmosphere is important to us
C.why there is air surrounding us D.why there is air pressure
Air moves under such conditions that
A.there is air pressure B.the air is heavy
C.air pressure doesn't remain the same all the time D.air comes up and down
Which of the following pictures best tells the movements of warm air and cold air?
According to the passage, in same areas if farmers who grow grapes (葡萄) light fires in the early morning, that is because the farmers want to________________.
A.drive away warm air B.prevent cold air from coming to harm their plants
C.cause more windD.stop warm air running away
【小题1】A
【小题2】C
【小题3】B
【小题4】B
解析:
【小题1】
【小题2】
【小题3】
【小题4】

One of my wonderful memories is about a Christmas gift. Unlike other gifts,it came without wrap(包装).
On September 11 th , 1 958,Mum gave birth to Richard.After she brought him home from hospital,she put him in my lap,saying, “I promised you a gift, and here it is.” What an honor! I turned four a month earlier and none of my friends had such a baby doll of their own.I played with it day and night. I sang to it, I told it stories.I told it over and over how much I loved it!
One morning, however,I found its bed empty. My doll was gone! I cried for it.Mum wept and told me that the poor little thing had been sent to a hospital.It had a fever. For several days,I heard Mum and Dad whispering such words as “hopeless”,“pitiful",and “dying”, which sounded Ominous.
Christmas was coming, “Don’t expect any presents this year,” Dad said, pointing at the socks I hung in the living room. “If your baby brother lives, that’ll be Christmas enough.” As he spoke,his eyes filled with tears. I’d never seen him cry before.
The phone rang early on Christmas morning.Dad jumped out of bed to answer it.From my bedroom I heard him say, “What? He’s all right?” He hung up and shouted upstairs. “The hospital said we can bring Richard home!” “Thank God!” I heard Mum cry.
From the window upstairs,I watched my parents rush out to the car.I had never seen them so happy. And I was also full of joy. What a wonderful day! My baby doll would be home. I ran downstairs. My socks still hung there flat.But I knew they were not empty: they were filled with love !
【小题1】What happened to the author on September 11th,1958?
A.He got a baby brother. | B.He got a Christmas gift. |
C.He became four years old. | D.He received a doll. |
A.Impossible. | B.Boring. | C.Difficult. | D.Fearful. |
A.Excitement. | B.Happiness. | C.Sadness. | D.Disappointment. |