单选题Twins often show great ______, but these twins are an exception. A. likelihood B. resistance C. resemblance D. contradiction

单选题The sales of the book by the famous writer continue to ______ like a run away balloon.

单选题As long as nations cannot themselves accumulate enough physical power to dominate all others, they must depend on______.

单选题All animals must rest, but do they really sleep as we know it? The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and unmoving——if it looks as though it is sleeping——then why not simply assume that it is in fact sleeping? But how can observers be sure that an animal is sleeping? They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These factors are important clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open? Even humans have occasionally been observed to sleep with one or both eyes partially open. Animals do not necessarily lie down to sleep either. Elephants, for example, often sleep standing up, with their tusks resting in the fork of a tree. Finally, while "sleeping" animals often seem unaware of changes in the sounds and light and other stimuli around them, that does not really prove they are sleeping either. Observations of animal behavior alone cannot fully answer the question of whether or not animals sleep. The answers come from doing experiments in sleep laboratories, using a machine called the electroencephalograph (EEC). The machine is connected to animals and measures their brain signals, breathing, heartbeat, and muscle activity. The measurements are different when the animals appear to be sleeping than when they appear to be awake. Using the EEC, scientists have confirmed that all birds and mammals studied in laboratories do sleep. There is some evidence that reptiles, such as snakes and turtles, do not truly sleep, although they do have periods of rest each day, in which they are quiet and unmoving. They also have discovered that some animals, like chimpanzees, cats, and moles (who live underground), are good sleepers while others, like sheep, goats, and donkeys, are poor sleepers. Interestingly, the good sleepers are nearly all hunters with resting places that are safe from their enemies. Nearly all the poor sleepers are animals hunted by other animals: they must always be watching for enemies, even when they are resting.

单选题The students take a ______ test in March, and the main exam is in July.

单选题With all its defects the little play has a real ______; it attracts a lot of people every day.

单选题Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for vehicle, you are much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is often treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason--mechanical failure, driver error and so on--have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph? Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver education. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient policing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.

单选题A membership card authorizes ______ the club's facilities for a period of 12 months.

单选题Baroque has been the term used by art historian for almost a century to ______ the dominant style of the period 1600 ～ 1750.

单选题You should keep a low ______ before this trouble passes.

单选题It must guarantee freedom of expression, to the end that all______to the flow ofideas shall be re-moved.(2007年中国人民大学考博试题)

单选题The Collector's Edition coin is______, and represents a true collector's treasure to be appreciated for generations to come. A. unlikely any Elvis Presley collectible ever released B. unlikely, and Elvis Presley collectible never released C. unlike any Elvis Presley collectible never released D. unlike any Elvis Presley collectible ever released

单选题The number of mistakes ______ the mark you receive in an examination.

单选题The consumers demand not only that the products conform to these standards but also that the environment and production conditions of manufacture ______ standard requirements.

单选题What makes basketball the most ______ of sports is how these styles do not necessarily clash.

单选题The best title of this passage is ______.

单选题Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for vehicle, you axe much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is often treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason—mechanical failure, driver error and so on—have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph? Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver education. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient policing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.

单选题One of the most damaging plant parasites is the stem eelworm.