单选题For sometime past it has been widely accepted that babies—and other creatures—learn to do things because certain acts lead to "rewards"; and there is no reason to doubt that this is true. But it used also to be widely believed that effective rewards, at least in the early stages, had to be directly related to such basic physiological "drives" as thirst or hunger. In other words, a baby would learn if he got food or drink or some sort of physical comfort, no otherwise. It is now clear that this is not so. Babies will learn to behave in ways that produce results in the world with no reward except the successful outcome. Papousek began his studies by using milk in normal way to" reward" the babies and so teach them to carry out some simple movements, such as turning the head to one side or the other. Then he noticed that a baby who had enough to drink would refuse the milk but would still go on making the learned response with clear signs of pleasure. So he began to study the children's responses in situations where no milk was provided. He quickly found that children as young as four months would learn to turn their heads to right or left if the movement "switched on" a display of lights—and indeed that they were capable of learning quite complex turns to bring about this result, for instance, two left or two right, or even to make as many as three turns to one side. Papousek's light display was placed directly in front of the babies and he made the interesting observation that sometimes they would not turn back to watch the lights closely although they would "smile and bubble" when the display came on. Papousek concluded that it was not primarily the sight of the lights which pleased them, it was the success they were achieving in solving the problem, in mastering the skill, and that there exists a fundamental human urge to make sense of the world and bring it under intentional control.

单选题What are the speakers discussing?

单选题—I can not repair these until tomorrow, I"m afraid. —That"s OK, there"s ______.

单选题If a girl wants to learn modern science and she prefers to stay neither by the ocean nor in the northeast, which college will she like best?

单选题What does the man want to buy?

单选题In my hometown, children are often ______ by parents to pay attention to their table manners during the Spring Festival.

单选题The home computer industry has been growing rapidly in the United States for the last ten years. Computers used to be large, expensive machines that were very difficult to use. But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity(普及) has been increasing as more people have been buying computers for their homes and businesses. Computers have been designed to store information and computer problems that are difficult for human beings to work out. Some have voices that speak with the operators. Stores use computers to keep records of their inventories(库存货物) and to send bills to their customers. Offices use computers to copy letters, record business and keep track(足迹) of the money they spend. One important new use for computers is for entertainment(娱乐). Many new games have been designed to be played on the computers. People of all ages have been playing these games. People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed.

单选题Helen did not go to bed early last night because she had to ______ for today's English test.

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单选题—Can you tell a way of escaping from a fallen house? —Oh. I think you'd better, waiting for rescuers.[A] can't move[B] stand in a quiet place[C] stay where you are[D] stand as still as you can

单选题The woman gathered a lot of ______ by writing many best-selling ______. A．wealths; work B．wealths; works C．wealth; work D．wealth; works

单选题Hangzhou is known ______ Chinese ______ her beauty ______ a famous touring city.

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单选题Money and Love{{/B}} When the Romantic Movement was still in its first favor, it was a common matter of debate (36) people should marry for love or for money. The young people concerned usually favored love, and their parents usually favored money. In the novels of the period the dilemma was felicitously (巧妙地) solved by the discovery, (37) the last page (38) the apparently penniless heroine was really a great heiress. But in real life young men (39) hoped for this denouement (结局) were apt to be disappointed. Prudent parents, (40) admitting that their daughters should marry for love, took care (41) all the young men they met should be rich. This method was sometimes very successful; it was adopted, for example, by my maternal grandfather, who had (42) romantic daughters, none of (43) married badly. In these days of psychology the matter no (44) looks so simple as it did eighty years ago. We realize now that money may be the cause, or part of the cause, of quite genuine love; of this there are notable examples in history. Benjamin Disraeli, (45) became lord Beaconsfield, (46) in his youth, poor and struggling and passionately ambitious. He married a rich widow, much (47) than himself, and (48) by the world to be rather silly. Owing (49) her, he was able to make his career a success. A cynical world naturally assumed that he loved her money (50) than he loved her, but in this the world was mistaken; through out the whole of their married life he was deeply and genuinely devoted (51) her. I do not suppose he would have loved her if she had been poor when he first knew her, but the gratitude which he felt for help (52) he owed to her kindly interest in him easily developed into a sincere affection. A great deal of affection is based upon the fact that its object is a help in (53) the purposes of the person who feels it. Men in whom ambition is the leading passion are likely to love women (54) assist them (55) their career, and it would be very shallow psychology to suppose that the love is not real because it has its instinctive root in self-interest.

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单选题The old lady looks best in ______ of that color.[A] dressing[B] a dress[C] dress[D] the dress

单选题Soon after he reached Australia, Captain Cook ______ to draw the map of the .east coast. A. set about B. set off C. set sail D. set out

单选题It's always difficult being in a foreign country, ______ if you don't speak the language. A. extremely B. naturally C. specially D. especially