考博习题练习
| 考博易错题（2019/7/18） |
| 第1题：The United States court system is characterized by ______ hierarchies: there are both state and federal courts.
A．double B．complex C．simple D．dual |
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| 第2题：He was ______ by the noise outside yesterday evening and could not concentrate on his study.
A．pecked B．oriented C．perturbed D．paddled |
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| 第3题：Motorways are, no doubt the safest roads inBritain. Mile (41) mile, vehicle for vehicle, you axe much (42) likely to be killed or seriously injured than on an ordinary roaD、On (43) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (44) than in a comparable accident (45) on the roads. Motorways have no (46) bends, no roundabouts or traffic lights and (47) speeds are much greater than on other roads. Though the 70 mph limit is (48) in force, it is often treated with the contempt that most drivers have for the 30 mph limit applying in built up areas inBritain.Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (49) ten meters between each vehicle. The resulting horrific pile-ups (50) one vehicle stops for some reason—mechanical failure, driver error and so on—have become all (51) familiar through pictures in newspapers or on television. How (52) of these drivers realize that it takes a car about one hundred meters to brake to a stop (53) 70 mphDrivers also seem to think that motorway driving gives them complete protection from the changing weather. (54) wet the road, whatever the visibility in mist or fog, they (55) at ridiculous speeds oblivious of police warnings or speed restrictions (56) their journey comes to a conclusion. Perhaps one remedy (57) this motorway madness would be better driver education.At present, learner drivers are barred (58) motorways and are thus as far as this kind of driving is (59) , thrown in at the deep enD、However, much more efficient policing is required, (60) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness. A、relatedB、consideredC、concernedD、touched |
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| 第4题：If a mother pushes her small son in a swing, giving only a light force each time he returns, eventually he will be swinging quite high. The child can do this for himself by using his legs to increase the motion, but both the mother’s push and the child’s leg movements must occur at the proper moment, or the extent of the swing will not increase. In physics, increasing the swing is increasing the amplitude; the length of the rope on the swing determines its natural oscillation perioD、This ability of an object to move periodically or to vibrate when stimulated by a force operating in its natural period is called resonance. Resonance is observed many times without consciously thinking about it; for example, one may find an annoying vibration or shimmy in an automobile, caused by a loose engine mount vibrating with increasing amplitude because of an out-of-round tire. The bulge on the tire slaps the pavement with each revolution; at the natural resonance point of the engine mount, it will begin to vibrate. Such vibrations can result in considerable damage if allowed to persist.Another destructive example of resonance is the shattering of a crystal goblet by the production of a musical tone at the natural resonant point of the goblet. The energy of the sound waves causes vibration in the glass; as its amplitude increases, the motion in the glass exceeds the elasticity of the goblet, and it shatters. An instrument called a tachometer makes use of the principle of resonance. It consists of many tiny bars, loosely fastened together and arranged so that each bar can slide independently of the others. Movement of the bars causes changes in a dial. When placed next to a rotating motor or engine, the tachometer picks up slight vibrations which are transferred to the resonant bars. These bars begin to move, and the resulting dial may be read to find the revolutions per minute of the motor very quickly. An object, if moving rhythmically when stimulated in a natural period, is said to ______.A．vibrate B．resonate C．swing D．oscillate |
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第5题： 
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