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4.4 What need the travelers NOT do to stay on guard in a foreign country?(1分)
A
Pay attention to the location.
B
Keep a close eye on their money items.
C
Keep a clear min
D
D. Buy a map in the hotel.
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试题答案:
D
答案解释:
相关题目
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
21.4 The phrase "make you stout" ( Para. 5) is closest in meaning to____.
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If you deny your children nothing, you will surely____ them.
Leifeng always helps people without expecting anything______ .(1分)
I would have paid _______ for my new dress if the salesman had insisted, because I loved it at the first sight.(1分)
1.4 Which of the following statements is TRUE?____(1分)
---What made Jack so upset? ---I believe _________ the gamE.It shocked him so mucH.(1分)
The number of cars which _______ exhibited at the auto show _______ uncountable.A) were; were B) were; wasC) was; were D) was; was(1分)
The young lady who caught the baby falling from the tenth floor _______ by the local media.(1分)
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