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[单选题]
______ here now, they would have a wonderful time together.(1分)
A
Were they
B
If they are
C
They are
D
They were
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试题答案：
A
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相关题目
Lucy was completely ______ after jogging in the hot sun all afternoon; she had little energy left(1分)
24.4 What has caused a big problem for Americans?(2分)
I try to memorize new words every day, but only remember few of them. ----- That’s not surprising. Newly-learnt words are easily forgotten unless frequently _____ in communication.(1分)
To give a detailed account of the effect of the birth control policy, you may consult the____ on population issued by the government.
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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
5. (A)long (B)short (C)wide (D)narrow
Writing a letter to the manager,he decided to talk to him in person.(1分)
The little girl showed no anxiety before the competition. She seemed ________ for it pretty well.(1分)
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