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[单选题]
The average temperature of this winter is very low, which is only degrees ______ zero.(1分)
A
up
B
at
C
on
D
above
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试题答案：
D
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相关题目
21.2 The central idea of the first paragraph is to____.
The reason _______ a whole room can be cooled down is ascribed to the air conditioner.(1分)
1.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)1.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
Radar makes it possible _______ a rocket during flight.(1分)
Those opinions are now out of____.
5. A.Called B.Calling C.call D.being called
6.It’s important for us to use a word or phrase according to the _____ in language studies.(1分)
22. Chess must be one of the oldest games in the world. An Arab traveler in India in the year 900 wrote that it was played "long, long ago". Chess was probably invented in India, and it has been played everywhere from Japan to Europe since 1400. The name "chess" is interesting. When one player is attacking the other's king, he says, in English,"check". When the king has been caught and cannot move anywhere, he says "check mate". These words come from Persian. "Shah mat" means "the king is dead". That is when the game is over, and one player has won.Such an old game changes very slowly. The rules have not always been the same as they are now. For example, at one time the queen could only move one square at a time. Now she is the strongest piece on the board. It would be interesting to know why this has happened! Chess takes time and thought, but it is game for all kinds of people. You don't have to be a champion in order to enjoy it. It is not always played by two people sitting at the same table. The first time the Americans beat the Russians was in a match played by radio. Some of the chess masters are able to play many people at the same time. The record was when one man played 400 games! It is said that some people play chess by post. This must make chess the slowest game in the world.(10分)22.1 Which of the following is known to be true?____(2分)A. Chess is an old Indian traveling game.B. Chess is the oldest game in the world.C. Chess was played in Japan and Europe before 1400.D. Chess was played in India long before 900.
Only after sowing ________, as you should never expect good result without endeavor.(1分)
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