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阅读理解
阅读下面短文，从每题所给四个选项中选出最佳答案。
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 warm 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.
1．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
2．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
3．According to the passage, in some 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 wind
D．stop warm air running away
查看习题详情和答案>>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 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 a force called pressure. As changes in air pressure take place, they, make air move.
Air is a gas that expands 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 warm air rises, cold air rushes in to take its place. Thus winds originate. 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.
1．The first paragraph mainly tells us ________.
[ ]
A．that there is air pressure
B．why air is invisible
C．why there is air around us
D．that there is air around us
2．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
3．Which of the following pictures best tells the movements of warm air and cold air?
[ ]
A．
B．
C．
D．
4．Why do farmers who grow fruit trees make fires in the early morning?
[ ]
A．To drive away warm air.
B．To prevent cold air from coming to harm their trees.
C．To cause more wind.
D．To stop warm air running away.
查看习题详情和答案>>Do you know Australia? Australia is the largest island in the world. It is a little smaller than China. It is in the south of the earth. Australia is big, but its population is not large. The population of Australia is nearly as large as that of Shanghai.
The government has made enough laws to fight pollution. The cities in Australia have got little air or water pollution. The sky is blue and the water is clean. You can clearly see fish swimming in the rivers. Plants grow very well.
Last month we visited Perth, the biggest city in western Australia, and went to a wild flowers' exhibition. There we saw a large number of wild flowers we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. In spring every year Perth has the wild flowers' exhibition. After visiting Perth, we spent the day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep coming towards us down the path.
Australia is famous for its sheep and kangaroos（袋鼠）．After a short drive from any town, you will find yourself in the middle of white sheep．Sheep, sheep, everywhere are sheep.
1．Australia is _____ .
A. the largest country in the world B．as large as Shanghai
C .not as large as China D．the largest island in the north of the earth
2. The sky in Australia is blue, because _____ .
A. enough laws have been made by the government
B．many laws have been made to fight against pollution
C．the cities there have got little water pollution
D. the population there is not large.
3．Which of the following is NOT true？
A. Perth is famous for its beautiful wild flowers.
B．Perth is bigger than any other city in Western Australia.
C. Perth lies in the west of Australia.
D. No other city is larger than Perth in Australia.
4. Which of the following has the closest meaning as "pick up" in paragraph 3？
A. Please pick me up on your way home this afternoon.
B．He picked up dancing when he lived among the dancers.
C. She picked up the magazines on the floor and put them on the shelf.
D．Mom picked up her jacket from the dry cleaner's.
查看习题详情和答案>>阅读理解
Without the atmosphere there would he 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 warm 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.
1．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
2．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
3．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 wind
D．stop warm air running away
查看习题详情和答案>>