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4.4By the fourth week of July conditions in the tropics were such that(1分)
A
human survival would be impossible
B
more and more people would lose their lives
C
fewer people could be saved
D
survival or death was still undecided
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试题答案：
D
答案解释：
相关题目
The Americans celebrate Christmas____ the Chinese celebrate the Spring Festival.
翻译题
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 noise of door _______ could be heard out in the street.(1分)
24.3 What may have been used to define a city in the past?(2分)
The time for the general offensive was approaching. The commander’s order soon came _______ all civilians should evacuate the village
he Chinese national football coach is______ to comment on the performance of his team.(1分)
21.5 How do children feel after their grandparents die?(2分)
Although she could _______ some noise when sleeping, the cars kept honking their horns because of the bad traffic, which almost drove her nut.(1分)
We are looking for people who are______ about oil and banking industries.(1分)
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