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[单选题]
It was through the Silk Road________ the four great ancient Chinese inventions of paper making, gunpowder, the compass and printing were introduced to the world.(1分)
A
Which
B
That
C
Where
D
what
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试题答案:
B
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9. (A) regret (B) mark (C)remember (D) touch
One of the puzzles still mystifying biologists is _______ when is the time for the organic to become old and finally die.(1分)
It is illegal for a public official to ask people for gifts or money _____ favors to them.(1分)
24.2 Which of the following makes a person feel stressed before going on holiday?____
The companies are working together to create ________ they hope will be the best means of transport in the 21st century.(1分)
3.3 In what way is the computer superior to the human brain?____(1分)
33.Researchers find that when a person tells lies ( ).
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
The current developments cast a ______ over the future relationship between the two countries.(1分)
The old man got into the____ of storing money under his bed.
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