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Travelling has really helped to broaden our ___________, which makes us wiser.(1分)
A
differences
B
horizons
C
shortcomings
D
hardships
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试题答案：
B
答案解释：
解题思路：句意：旅游可以扩大我们的眼界，让我们更加明智。horizons表示”视野，眼界“。
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8. A. privacy B. exclusiveness C. individual D. quiet
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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
22.Many American colleges permit foreign students to live in college housing or housing not owned by the university,such as an apartment.College housing is usually in a dormitory,or dorm for short.Many foreign students say that the dorms are less costly than apartments.They say dorms offer quiet study areas and areas for social activities or sports.They say dorms are close to places they go every day,like the library,computer center and classrooms.They also say that living in the room provides the best chance to get to know other students.Dormitories may have as few as twelve students or as many as one thousand.Some dorms are organized into areas called suites.Suites have several bedrooms,a large living area and a bathroom.Six or more people may live in one suite.Other dorms have many rooms along a hallway.Two students usually live in each room.On each floor there is a large bathroom for all the students who live on that floor.Sometimes there is also a kitchen for preparing food.In most universities ,males and females live in the same dorm.They may even live on the same floor.But they usually may not live in the same room or suite.Most universities have some dorms for men and women.(10分)22.1Where do some foreign students in American colleges prefer to live?(2分)A. In a hotelB. In a houseC. In an apartmentD. In a friend's home
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