单选题Guarantees and warranties tell buyers the repairs for which a manufacturer is______.(2013年3月中国科学院考博试题)

单选题The teachers tried tothese students that they could solve the complicated problem, however, they just didn"t see the point. ______

单选题Finally this theory is widely understood and accepted the world over, i.e. it has a ______; and is therefore a good basis for discussion of an ethical problem.

单选题At first, movies were little more than amusing______pictures that appeared to move.(北京大学2009年试题)

单选题Proper clothes______for much in business. Thai's why you see most business people dress formally.(2002年上海交通大学考博试题)

单选题The word "lady" has ______of refinement and excessive femininity that some women find offensive. A. abdomen B. connotations C. sashes D. syndicates

单选题{{B}}Directions:{{/B}} There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets.{{B}}Passage One{{/B}} 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In winter drivers have trouble stopping their cars from ______ on icy roads.

单选题Very few scientists ______ with a completely new answer to the world"s problem.

单选题The earthquake happened in South Xinjiang on Feb. 24. This______ killed 266 people.(2004年武汉大学考博试题)

单选题What can we learn about Africana. com?

单选题She criticized my writing but in a way that was very ______. I learned a lot from her. A.autonomous B.constructive C.fundamental D.elementary

单选题A number of animals in Aesop' s fables are portrayed as being crafty.

单选题______, he finds the work interesting.

单选题An old woman was badly hurt in ______ the police describe as an apparently motiveless attack.

单选题What the witness said in court was not ______ with the statement he made to the police.