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[单选题]
She is very good ______people from all walks of life.(1分)
A
At
B
For
C
Of
D
with
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试题答案：
D
答案解释：
相关题目
The books on the left are for small children while those on the right are for____.(1分)
If any lady owns this watch, will she please come forward and____ it?
The government has promised to do _______ lies in its power to accommodate the victims in the earthquake
It is desired that new rules to the attention of all the students.(1分)
The policeman and new mother who saved six children in the river while pregnant ______ the conference.(1分)
22.4 Which of the following is NOT correct?____(2分)
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
One of the attractive features of the course lies in the fact that the practice is with theory.(1分)
22.5 Which of the following statements is true?____
2. (A)together (B)alone (C)crowdedly (D)lonely
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