单选题After scientists did some research ______ the health of workers, the government tried to find some way to meet their demand.A. intoB. offC. aboutD. for

单选题{{B}}Passage 5{{/B}} Social psychologists arc used to hearing that their experiments are a waste of time because they just prove the obvious, and tell us what we always knew. But there is a very simple and effective riposte to this accusation. The trouble with folk-wisdom (what we always knew) is that it tends to come in pairs of statements, both of which are obviously' true, but which—unfortunately—are mutually exclusive. For example, birds of a feather flock together, but what about the attraction of opposites? Experiments may not be as much fun as intuitions, but they sometimes tell us which proverbs are actually true, or (moor often) in what circumstances which apply. There is one other preconception to be removed before tackling the question of whom we like and love, whom we find attractive and make friends with: "Why bother to study an area in which we are all expert practitioners?" Well, ff you believe that, have a word with a marriage guidance counselor, a psychiatrist, or someone involved in industrial relations. Research on friendship has established a number of facts, some interesting, some even useful. Did you know that the average student has 5-6 friends, or that a friend who was previously an enemy is liked more than the one who has always been on the right side? Would you believe that physically attractive individuals are preferred as friends to those less comely, and is it fair that physically attractive defendants are less likely to be found guilty in court? Unfortunately, such tidbits don't tell us much more than the nature or the purpose of friendship. In fact, studies of friendship seem to implicate more complex factors. For example, one function friendship seems to fulfill is that it supports the image we have of ourselves, and confirms the value of the attitudes we hold. Several studies have shown that we judge them to be more like us than they (objectively) are. This suggests that we ought to choose friends who are similar to us ('birds of a feather') rather than those who would be complementary ('opposites attract'), a prediction which is supported by empirical evidence, at least so far as attitudes and beliefs are concerned. In one experiment, some developing friendships were monitored amongst first-year students living in the same hostel. It was found that similarity of attitudes (towards politics, religion, and ethics, pastimes and aesthetics) was a good predictor of what friendships would be established by the end of four months, though it had less to do with initial alliances. The difficulty of linking friendship with similarity of personality probably reflects the complexity of our personalities. This of course can explain why we may have two close friends who have little in common and indeed dislike each other. By and large, though, it looks as though we would do well to choose friends ( and spouses) who resemble us. If this were not so, computer dating agencies would have gone out of business years ago.

单选题Under a microscope , muscle cells appear to be ______ .

单选题By the time I got home, my mother ____ to bed.

单选题______ are activities a person does well.

单选题She's always the first guest______ and the last______.

单选题His Selected Poems ______ in 1955. A) was first published B) has been first published C) were first published D) had first been published

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单选题 Researchers are finding that boys and girls really are from two different planets. Boys and girls have different "crisis points", experts say, stages in their emotional and social development where things can go very wrong. Until recently, girls got all the attention. But boys are much more likely than girls to have discipline problems at school and to be diagnosed with Attention Deficit Disorder (ADD). Boys far outnumber girls in special-education classes. They're also more likely to commit violent crimes and end up in jail. Even normal boy behavior has come to be considered pathological (病态的) in the wake of the feminist movement. An abundance of physical energy and the urge to conquer — these are normal male characteristics, and in an earlier age they were good things, even essential to survival. "If Huck Finn or Tom Sawyer were alive today," says Michael Gurian, author of The Wonder of Boys, "we'd say they had ADD." He says one of the new insights we're gaining about boys is a very old one: boys will be boys. "They are who they are," says Gurian, "and we need to love them for who they are. Let's not try to {{U}}rewire{{/U}} them." But what exactly is the essential nature of boys? Even as infants, boys and girls behave differently. A recent study at Children's Hospital in Boston found that boy babies are more emotionally expressive; girls are more reflective. (That means boy babies tend to cry when they're unhappy; girl babies suck their thumbs) This could indicate that girls are innately more able to control their emotions. Boys have higher levels of testosterone and lower levels of neurotransmitter serotonin, which inhabits aggression and impulsivity. That may help explain why more males than females carry through with suicide or become alcoholics. There's struggle — a desire and need for warmth on the one hand and a pull toward independence on the other. Boys are going through what psychologists long ago declared an integral part of growing up: individualization and disconnection from parents, especially mothers. But now some researchers think that process is too abrupt. When boys repress normal feelings like love because of social pressure, says William Pollack, head of the Center for Men at Boston's McLean Hospital, "they've lost contact with the genuine nature of whom they are and what they feel. Boys are in a silent crisis. The only time we notice it is when they pull the trigger."

单选题It is hard to box against a southpaw, as Apollo Creed found out when he fought Rocky Balboa in the first of an interminable series of movies. While "Rocky" is fiction, the strategic advantage of being left-handed in a fight is very real, simply because most right-handed people have little experience of fighting left-handers, but not vice versa. And the same competitive advantage is enjoyed by left-handers in other sports, such as tennis and cricket. The orthodox view of human handedness is that it is connected to the bilateral specialization of the brain that has concentrated language-processing functions on the left side of that organ. Because, long ago in the evolutionary past, an ancestor of humans ( and all other vertebrate animals ) underwent a contortion that twisted its head around 180~ relative to its body, the left side of the brain controls the right side of the body, and vice versa. In humans, the left brain (and thus the right body) is usually dominant. And on average, lefthanders are smaller and lighter than right-handers. That should put them at an evolutionary disadvantage. Sporting advantage notwithstanding, therefore, the existence of left-handedness poses a problem for biologists. But Charlotte Faurie and Michel Raymond, of the University of Montpellier Ⅱ , in France, think they know the answer. As they report in the Proceedings of the Royal Society, there is a clue in the advantage seen in boxing. As any schoolboy could tell you, winning fights enhances your status. If, in prehistory, this translated into increased reproductive success, it might have been enough to maintain a certain proportion of left-handers in the population, by balancing the costs of being left-handed with the advantages gained in fighting. If that is true, then there will be a higher proportion of left-handers in societies with higher levels of violence, since the advantages of being left-handed will be enhanced in such societies. Dr Faurie and Dr Raymond set out to test this hypothesis. Fighting in modem societies often involves the use of technology, notably firearms, that is unlikely to give any advantage to left-handers. So Dr Faurie and Dr Raymond decided to confine their investigation to the proportion of left-handers and the level of violence ( by number of homicides) in traditional societies. By trawling the literature, checking with police departments, and even going out into the field and asking people, the two researchers found that the proportion of left-handers in a traditional society is, indeed, correlated with its homicide rate. One of the highest proportions of left-handers, for example, was found among the Yanomamo of South America. Raiding and warfare are central to Yanomamo culture. The murder rate is 4 per 1 000 inhabitants per year (compared with, for example, 0.068 in New York). And, according to Dr Faurie and Dr Raymond, 22.6% of Yanomamo are left-handed. In contrast, Dioula-speaking people of Burkina Faso in West Africa are virtual pacifists. There are only 0. 013 murders per 1 000 inhabitants among them and only 3.4% of the population is left-handed. While there is no suggestion that left-handed people are more violent than the right-handed, it looks as though they are more successfully violent. Perhaps that helps to explain the double meaning of the word "sinister".

单选题A little learning is a dangerous thing, ______ the saying goes.

单选题Scientists formerly assumed that coral populations remained stable, dead polyps being replaced by now ones that build on the "skeletons" left behind. Recent investigations, however, reveal more dynamic processes. Whole sections of a colony may die and not be replaced. This process, known as partial colony mortality, is evident in a series of photographs over time, but often impossible to detect in site because "skeletons" bared by the death of overlying tissue are readily overgrown by other organisms or abraded by grazers. Partial mortality can produce fission the process of a large colony splitting apart into two or more adjacent colonies that presumably have identical genetic makeup. Subsequent lateral growth may unite these colonies in a process called fusion. As a consequence of these three processes, estimates of coral ages based on size are Partial mortality and fission, which reduce colony size, occur more frequently than fusion, and thus estimates of coral age based on colony size are probably far too low.

单选题The 20-year-old tennis player"s dream is to ______ China at 2008 Beijing Olympic Games.

单选题The author's attitude towards the jury system is______.

单选题The new appointment of our president ______ from the very beginning of next semester. A. takes effect B. takes part C. takes place D. takes turns

单选题______of the seven continents were placed in the Pacific Ocean, there would still be room left for another continent the size of Asia.

单选题Here is ______ for you, Mr. Smith. A. a luggage B. luggages C. a piece of luggage D. a piece of luggages

单选题I'm sure that she'll cope with the changes very well. She is very ______.