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[单选题]
Provided you’ve paid in advance we won’t ______ you for delivery.(1分)
A
expend
B
cost
C
spend
D
charge
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试题答案：
D
答案解释：
相关题目
4. A.similar B.same C.different D.various
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)3.1 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
If it ______ fine this weekend, we ______ a picnic in the forest.(1分)
______the next day, we would have climbed the mountain with her.(1分)
23.2 The first paragraph mainly discusses ________.(2分)
22.5 The use of authentic materials is going to be discussed .(2分)
“Time,” says the proverb, “is money”. This means that every moment well spent may put some money into our pockets. If our time is usefully employed, it will either turn out some useful important piece of work which will fetch its price in the market, or1. it will add to our experience increase our capacities so as to enable us to earn money when the proper opportunity comes. Our life is nothing more than our time. To kill time is therefore a form of suicide. 2.We are shocked when we think of death, we spare no pains, no trouble, no expense to preserve life. 3.But we are too often indifferent to the loss of an hour or of a day, forgetting that our life is the sum total of the days of the hours we live. Our life is a brief period measuring some seventy or eighty years in all. But nearly one third of this has to be spent in sleep; some years have to be spent over our meals; some in making journeys on lvoyages by sea; some in merry making. Now if all these years were to be deducted(扣除) from the term over which our life extends, we shall find about twenty or thirty years at our disposal for active work. 4.Whoever remembers this can never willingly waste a single moment of his life. All time is precious，but the time of our childhood of our youth is more precious than any other portion of our existence.5.for those are the periods when we can acquire knowledge develop our capacities. If we allow these morning hours of life to slip away, we shall never be able to recover the loss. Just as money laid out at interests doubles trebles itself in time, so the precious hours of childhood youth, if properly used, will yield us incalculable advantages.(20分)
Steven ________ the examination, but he wasn't careful enough.(1分)
When it _____ air pollution,Beijing faces the three “C” s,cars,coal and construction,which lead to Beijing's thick air pollution．(1分)
2.5Which of the following best describes this story?____(1分)
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简述管理是社会生产力实现的基础。
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y=(2x2+3)(3x-2)的导数是（ ）
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4.2Few people in the United States lost their lives because_________.(1分)
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Ada’s professor had her _______ her dissertation many times before finally giving her the chance to give oral defense.(1分)
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