[简答题]One might ask why speculation is permitted when there is so real a danger of loss. The basic reason is that speculation can perform useful functions in the market equilibrium and encourages faster entry of more suppliers, ff the price change lagged until after an actual commodity shortage had occurred, the fluctuation would probably be sharper and more sudden. Remedial supply action could not be further delayed. Similarly, if speculators foresee a surplus in some commodity, their selling of futures will help drive the price down to some extent before the surplus actually occurs. When speculators foresee a shortage and bid up the price, they are also helping to conserve the present supply. As the price goes up, less of the commodity is purchased; a rib in price encourages users to economize. Similarly, a lowering of price encourages users to buy more, thus helping to sell the surplus which is developing.

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[填空题]When (ask) ______ why he came to the exhibition, he said that he had been interested in oil paintings for years.

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[单项选择]Passage Two

Ask why most people are right-handed, and the answer might fall along the same lines as why fish school(鱼成群地游). Two neuroscientists suggest that social pressures drive individuals to coordinate their behaviors so that everyone in the group gets an evolutionary edge.
Approximately 85 percent of people prefer their right hand, which is controlled by the left hemisphere of the brain. One theorized benefit of locating a particular function in one hemisphere is that it frees the other to deal with different tasks. But that idea does not explain why. population-wide trends for handedness exist in the first place.
Moreover, evidence gleaned in recent years has overturned the long-held belief that human handedness is a unique by-product of brain specialization attributable to language. A suite of studies has revealed brain lateraliz
A. it was a necessary evolutionary process
B. it has something to do with human right-handedness
C. they need to coordinate with other fish
D. their brain function is unique

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[单项选择]Passage Two

When imaginative men turn their eyes towards space and wonder whether life exists in any part of it, they may cheer themselves by remembering that life need not resemble closely the life that exists on Earth. Mars looks like the only planet where life like ours could exist, and even this is doubtful. But there may be other kinds of life based on other kinds of chemistry, and they may multiply on Venus or Jupiter. At least we cannot prove at present that they do not.
Even more interesting is the possibility that life on their planets may be in a more advanced stage of evolution. Present-day man is in a peculiar and probably temporary stage. His individual units retain a strong sense of personality. They are, in fact, still capable under favorable circumstances of leading individual lives. But man’s societies are already sufficien
A. Imaginative men are sure of success in finding life on other planets.
B. Imaginative men are delighted to find life on other planets.
C. Imaginative men are happy to find a different kind of life existing on other planets.
D. Imaginative men can be pleased with the idea that there might exist different forms of life on other planets.

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[简答题]Burning garbage might be one kind of energy source that we can use to help meet our energy needs. ( Passage 2)

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[单项选择]The passage suggests that when putting paint on the outside of your house, you should be careful ______.

A. not to let other people interfere
B. to use paint that will withstand both winter and summer conditions
C. to allow for slight fading of the colors
D. to take into account the general appearance of the area

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[单项选择]The passage shows us when Americans need advice they often get it from ______.

A. women
B. books
C. letters
D. strangers

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[填空题]The restaurant was prosecuted when it was found that the food served Was not ______ (达到消费标准).

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[填空题]Eating When One Feels Hungry

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[单项选择]They found the （　） bridge when they went across the village.
A. old stone Chinese
B. Chinese old stone
C. old Chinese stone
D. Chinese stone old

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