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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
查看习题详情和答案>>完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A，B，C和D）中，选出最佳选项。
I went to Beijing this National holiday, and it was an interesting experience of my life.
My friends told us that taking the “hard 36 ”to Beijing would be really terrible. So we didn’t know what to 37 . But we were pleasantly surprised when we finally boarded the
38 , which was relatively modern and 39 . During the 14 - hour ride we ate peanuts and talked. It was not 40 at all.
It was morning when we arrived. We stepped out of the railway station, having sat in hard seats and not getting much 41 . However, We had energy, First we tried to get teturn tickets to Shanghai, but the tickets seller 42 us that tickets would not be on 43 for another two days. We were a little worried about getting 44 , but we made up our minds to 45 for the hotel to put our bags down. After fighting our way 46 the“ gypsy”taxi drivers that tried to 47 us one hundred yuan for the ride, we found a taxi and it 48 cost us thirty yuan to get 49 we had planned to go. When we reached the hotel, there was a window for airplane and train tickets. 50 the man behind the counter could get tickets that day, which we
51 . The most important lesson about China I ever 52 , is to get someone to do your work for you, and it seems to work out much 53 . We were not able to get tickets, but the
54 agents（代理）could.
While in Beijing we saw a lot of places of interest, most of which were very 55 . It was fun to be with thousands of people in one place, There aren’t any words to describe it.
36．A. chair B. bed C. seat D. bench
37．A. provide B. expect C. happen D. think
38．A. plane B. bus C. ship D. train
39．A. quick B. clean C. simple D. long
40．A. bad B. good C. easy D. hard
41．A. trouble B. food C. sleep D. help
42．A. promised B. informed C. advised D. persuaded
43．A. time B. show C. duty D. sale
44．A. behind B. out C. through D. back
45．A. start B. ask C. look D. pay
46．A. towards B. into C. across D. past
47．A. offer B. charge C. bargain D. share
48．A. even B. still C. also D. only
49．A. what B. which C. where D. how
50．A. Somehow B. However C. Therefore D. Otherwise
51．A. wouldn't B. couldn't C. shouldn't D. needn't
52．A. learned B. taught C. offered D. heard
53．A. harder B. earlier C. later D. easier
54．A. business B. transport C. travel D. hotel
55．A. interesting B. crowded C. famous D. noisy
查看习题详情和答案>>I went to Beijing this National holiday, and it was an interesting experience of my life.
My friends told us that taking the “hard 36 ”to Beijing would be really terrible. So we didn’t know what to 37 . But we were pleasantly surprised when we finally boarded the 38 , which was relatively modern and 39 . During the 14 - hour ride we ate peanuts and talked. It was not 40 at all.
It was morning when we arrived. We stepped out of the railway station, having sat in hard seats and not getting much 41 . However, We had energy, First we tried to get return tickets to Shanghai, but the tickets seller 42 us that tickets would not be on 43 for another two days. We were a little worried about getting 44 , but we made up our minds to 45 for the hotel to put our bags down. After fighting our way 46 the“ gypsy” taxi drivers that tried to 47 us one hundred yuan for the ride, we found a taxi and it 48 cost us thirty yuan to get 49 we had planned to go. When we reached the hotel, there was a window for airplane and train tickets. 50 the man behind the counter could get tickets that day, which we 51 . The most important lesson about China I ever 52 , is to get someone to do your work for you, and it seems to work out much 53 . We were not able to get tickets, but the 54 agents（代理）could.
While in Beijing we saw a lot of places of interest, most of which were very 55 . It was fun to be with thousands of people in one place, There aren’t any words to describe it.
36．A. chair B. bed C. seat D. bench
37．A. provide B. expect C. happen D. think
38．A. plane B. bus C. ship D. train
39．A. quick B. clean C. simple D. long
40．A. bad B. good C. easy D. hard
41．A. trouble B. food C. sleep D. help
42．A. promised B. informed C. advised D. persuaded
43．A. time B. show C. duty D. sale
44．A. behind B. out C. through D. back
45．A. start B. ask C. look D. pay
46．A. towards B. into C. across D. past
47．A. offer B. charge C. bargain D. share
48．A. even B. still C. also D. only
49．A. what B. which C. where D. how
50．A. Somehow B. However C. Therefore D. Otherwise
51．A. wouldn't B. couldn't C. shouldn't D. needn't
52．A. learned B. taught C. offered D. heard
53．A. harder B. earlier C. later D. easier
54．A. business B. transport C. travel D. hotel
55．A. interesting B. crowded C. famous D. noisy
查看习题详情和答案>>One night this summer, on my way home from work I decided to see a movie. I knew the theatre would be air conditioned and I couldn’t face my 36 apartment. Sitting in the theatre I had to 37 the opening between the two tall heads in front of me. I had to keep changing the 38 every time she leaned over to talk to him, 39 he leaned over to kiss her. Why do Americans display such 40 in a public place？I thought the movie would help improve my English, but as it 41 ,it was an Italian movie. 42 about an hour I decided to give up the movie and 43 my popcorn. I’ve never understood why they gave me so much popcorn！It tasted pretty good , 44. With time going by, I understood 45 of the romantic sounding Italians. I just heard the 46 of the popcorn chewed between my teeth. My thought started to 47.I remembered when I was in South Korea, I 48 to watch a host on TV frequently. He seemed like a good friend to me, until I saw him 49 on TV in New York speaking 50 English instead of perfect Korean. He didn’t 51 have a Korean accent！I felt like I had been betrayed (背叛)．
When our family moved to the United States six years ago, none of us spoke any English. 52 we had picked up a few words, my mother suggested that we all should practise English at home. Everyone agreed, but our house became terribly 53 and we all seemed to avoid each other. When we couldn’t avoid seeing each other, our expressions were stiff (僵硬的)．Sitting at the dinner table we preferred silence to 54 a difficult language. Mother 55 to say something in English but it came out all wrong and we all burst into laughter and decided to forget it！We’ve been speaking Korean at home ever since.
1. A．warm B．hot C．heated D．uncomfortable
2. A．wander through B．walk through C．run through D．look through
3. A．room B．seat C．space D．angle
4. A．however B．but C．or D．and
5. A．excitement B．feeling C．privacy D．love
6. A．came about B．came up C．turned up D．turned out
7. A．Within B．After C．For D．Before
8. A．concentrate on B．stare at C．work on D．stick with
9. A．too B．either C．anyhow D．somehow
10. A．much B．something C．nothing D．anything
11. A．nutrient B．sound C．explosion D．smell
12. A．stop B．wander C．imagine D．fascinate
13. A．started B．began C．devoted D．used
14. A．again B．immediately C．closely D．clearly
15. A．fake B．informal C．perfect D．practical
16. A．even B．always C．occasionally D．frequently
17. A．Unless B．If C．Before D．Since
18. A．noisy B．quiet C．exciting D．still
19. A．improving B．reading C．writing D．speaking
20. A．managed B．happened C．tried D．had
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完形填空：阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。（共20小题，每小题1.5分）
In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 46 . Today things are 47 , the world has become too 48 . We are using up our natural resources too quickly, and at the same time we are 49 our environment with dangerous chemicals. If we continue to do this, human life on the earth 50 survive.
Everyone 51 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 52 , more and more fish are caught. We know that if too many trees are cut down, 53 will disappear and nothing will grow on the land. Yet, we 54 to use bigger and more powerful machines to 55 more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. 56 , in most countries wastes are 57 put into rivers or into the sea, and there are 58 laws to stop this. We know, too, that if the 59 of the world continues to rise at the present rate, in a few years there will not be enough 60 . What can we do to solve these problems ?
If we eat more vegetables and less 61 , there will be more food available for everyone. Land that is used to grow crops 62 five times more people than land where animals are kept. Our natural resources will 63 longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth 64 .
Finally, if we educate people to think about the problems, we shall have a better and clearer 65 in the future.
1.A. beautiful B. unlimited C. rare D. valuable
2.A. common B. the same C. changeable D. different
3.A. crowded B. small C. dirty D. busy
4.A. protecting B. saving C. polluting D. fighting
5.A. may not B. will not C. shall not D. could not
6.A. wonders B. realizes C. consider D. discovers
7.A. poles B. boats C. methods D. ideas
8.A mountains B. the sea C. trees D. forests
9.A. continue B. have C. ought D. go on
10.A. grow B. plant C. save D. cut down
11.A. Thus B. However
C. Generally speaking D. Therefore
12.A. still B. even C. also D. certainly
13.A. too many B. a few C. some D. few
14.A. production B. pollution C. population D. revolution
15.A. houses B. vegetables C. food D. lives
16.A. fruit B. meat C. fish D. grain
17.A. feeds B. increases C. supplies D. helps
18.A. use B. stay C. keep D. last
19.A. control B. born C. plan D. reward
20.A. nature B. sea C. planet D. forest
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