题目内容
An emotion that is less well understood is jealousy. Why do people become jealous in intimate sexual relationships？ One series of studies tested evolutionary hypotheses about differences in the concerns men and women have about their partners' fidelity. Since females can have only a limited number of children during their lifetimes, to maximize their reproductive success they should be motivated to form. relationships with males who have resources and will contribute them to their offspring. Indeed, cross-cultural evidence demonstrates that one of the main mate selection criteria used by females around the world is mate resources. From a female's point of view, then, infidelity accompanied by emotional commitment to the other woman is a major threat to resources. A man unlikely to divert re- sources from his mate and her offspring to a casual fling, but the risk increases dramatically if he becomes emotionally involved and perhaps considers switching long-term partners. Hence, a woman's jealousy would be expected to focus on her mate's emotional commitment to another female.
For males, the situation is different. If a male commits himself to an exclusive relationship with a female, he must be certain that the offspring in whom he is investing are his own. Since he cannot be sure of paternity, the best he can do is to prevent his mate from copulating with any other males. In males, then, jealousy would be expected to focus less on the female's emotional commitment or resources and more on her tendency to give other males sexual access. Indeed, in species ranging from insects to humans, males take extreme measures to prevent other males from inseminating their mates. In humans, male sexual jealousy is the leading cause of homicides and of spouse battering cross-culturally.
This passage discusses the ______ approach to human emotions.
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听力原文： Since the 1960s, the English diet has become more diverse; the English now eat a wide variety of European and Asian foods. Many traditional foods such as beef and potatoes have given way to poultry and pasta (面食) dishes. Fast food bas also become more available, and hamburger restaurants now rival the traditional fish-and-chip shops in popularity. Numerous Chinese and Indian restaurants and pizza houses provide take-away service, and many pubs serve anything from snacks to fun meals as well as alcoholic beverages. Traditional English dishes include roost beef and Yorkshire pudding and steak and kidney pie.
The English generally eat three meals a day. A traditional English breakfast consists of any or all of the following: bacon, sausages, grilled (烤炙的) or fried tomatoes, mushrooms, eggs, or toast. Black pudding (blood pudding) may also appear on the menu. However, fewer people now eat a cooked breakfast on a regular basis, preferring various combinations of carnal, toast, juice or fruit, and tea or coffee. The midday meal is usually referred to as lunch and the evening meal as dinner or, when it is less formal, as supper. Working-class people tend to call the midday meal dinner and the meal they have in the early evening "tea." The tradition of afternoon tea, when tea, biscuits, and cakes are enjoyed at about 4 pm, has declined. Similarly, many people no longer have more than a light lunch or snack in the middle of the day.
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A．He sent the drill back and asked for his deposit.B．He went to the salesman for excha
The journalists and Camera crews began to ______in the heat as they stood waiting for the
The Greek's lofty attitude toward scientific research——and the scientists' contempt of utility was a long time dying. For a millennium after Archimedes, this separation of mechanics from geometry inhibited fundamental technological progress and in some areas repressed it altogether. But there was a still greater obstacle to change until the very end of the middle ages: the organization of society. The social system of fixed class relationships that prevailed through the Middle Ages (and in some areas much longer) itself hampered improvement. Under this system, the laboring masses, in exchange for the bare necessities of life, did all the productive work, while the privileged few——priests, nobles, and kings——concerned themselves only with ownership and maintenance of their own position. In the interest of their privileges they did achieve considerable progress in defense, in warmaking, in government, in trade, in the arts of leisure, and in the extraction of labor from their dependents, but they had no familiarity with the process of production. On the other hand, the laborers, who were familiar with manufacturing techniques, had no incentive to improve or increase production to the advantage of their masters. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leisure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved.
The whole ancient world was built upon this relationship——a relationship as sterile as it was inhuman. The availability of slaves nullified the need for more efficient machinery. In many of the coxnmonplace fields of human endeavor, actual stagnation prevailed for thousands of years. Not all the glory that was Greece and the grandeur that was Rome could develop the windmill or contrive so simple an instrument as the wheelbarrow——products of the tenth and thirteenth centuries respectively.
For about twenty-five centuries, two-thirds of the power of the horse was lost because he wasn't shod, and much of the strength of the ox was wasted because his harness wasn't modified to fit his shoulders. For more than five thousand years, sailors were confined to rivers and coasts by a primitive steering mechanism which required remarkably little alteration (in the thirteenth century) to become a rudder.
With any ingenuity at all, the ancient plough could have been put on wheels and the ploughshare shaped to bite and turn the sod instead of merely scratching it——but the ingenuity wasn't forthcoming. And the villager of the Middle Ages, like the men who first had fire, had a smoke hole in the center of the straw and reed thatched roof of his' one-room dwelling (which he shared with his animals), while the medieval charcoal burner (like his Stone Age ancestor) made himself a hut of small branches.
Lack of technological progress in the ancient and medieval worlds was primarily due to the absence of ______.
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