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The energy contained in rock within the earth’s crust represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/ or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near tile surface but there is insufficient water present to produce eruptive phenomena. Thus a potential hot dry rock (HDR) reservoir exists whenever the amount of spontaneously produced geothermal fluid has been judged inadequate for existing commercial systems.
As a result of the recent energy crisis, new concepts for creating HDR recovery systems— which involve drilling holes and connecting them to artificial reservoirs placed deep within the crust—are being developed. In all atte
A. alert readers to the existence of HDR’s as an available energy source
B. document the challenges that have been surmounted in the effort to recover energy from HDR’s
C. warn the users of coal and oil that HDR’s are not an economically feasible alternative
D. encourage the use of new techniques for the recovery of energy from underground hot water and steam

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{{B}}TEXT F{{/B}}

The energy contained in rock within the earth’s crust represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/ or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near tile surface but there is insufficient water present to produce eruptive phenomena. Thus a potential hot dry rock (HDR) reservoir exists whenever the amount of spontaneously produced geothermal fluid has been judged inadequate for existing commercial systems.
As a result of the recent energy crisis, new concepts for creating HDR recovery systems— which involve drilling holes and connecting them to artificial reservoirs placed deep within the crust—are being developed. In all atte
A. petrological research report focused on the history of temperature-depth records in the United States
B. congressional report urging the conservation of oil and natural gas reserves in the United States
C. technical journal article concerned with tile recoverability of remaining coal resources
D. consumer report describing the extent and accessibility of remaining coal resources

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The energy contained in rock within the earth’s crust represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near the surface but there is insufficient water present to produce eruptive phenomena. Thus a potential hot dry rock (HDR) reservoir exists whenever the amount of spontaneously produced geothermal fluid has been judged inadequate for existing commercial systems.
As a result of the recent energy crisis, new concepts for creating HDE recovery systems—which involve drilling holes and connecting them to artificial reservoirs placed deep within the crust—are being developed. (46) In all attempts to retrieve energy from HED’s

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[简答题]The energy contained in rock within the earth’s crust (地壳) represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near the surface but there is insufficient water present to produce eruptive phenomena. Thus a potential hot dry rock (HDR) reservoir exists whenever the amount of spontaneously produced geothermal fluid has been judged inadequate for existing commercial systems.
As a result of the recent energy crisis, new concepts for creating HDE recovery systems—which involve drilling holes and connecting them to artificial reservoirs placed deep within the crust—are being developed. (46) In all attempts to retrieve energy from HED’s reservoir artificia

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In ancient Greece athletic festivals were very important and had strong religious associations. The Olympian athletic festival held every four years in honor of Zeus, king of the Olympian Gods, eventually lost its local character, and became first a national event and then, international.
The Games took place in August on the plain by Mount Olympus. Many thousands of spectators gathered from all parts of Greece. Slaves, women and dishonored persons were not allowed to compete. The exact sequence of events is uncertain, but events included boy’s gymnastics, boxing, wrestling, horse racing and field events.
On the last day of the Games, all the winners were honored by having a ring of holy olive leaves placed on their heads. So great was the honor that the winner of the foot race gave his name to the year of his victory. Although Olympic winners received no prize money, they were, in fact, richly rewarded
A. only male Greek athletes were allowed to participate in the Games
B. all Greeks, irrespective of sex, religion or social status, were allowed to take part in
C. all Greeks, with the exception of women, were allowed to compete in the Games
D. all male Greeks were qualified to compete in the Games

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Paris: Thanks to a French insurance company, brides and bridegrooms with cold feet no longer face financial disaster from a canceled wedding. For a small premium, they can take out a policy protecting them from love gone away or anything else that threatens to rain on their big day.
Despite France’s economic woes, the amount of money spent on weddings is rising 5-10 per cent a year. And people in the Paris region now dish out an average of 60,000 francs on tying the knot. But life is unpredictable and non-refundable, so French insurers have stepped in to ease the risk, finding their own little niche in the business of love. They join colleagues in Britain, where insurers say wedding cancellation policies have been around for about a decade.
About 5 per cent of insured weddings there never make it
A. To thank a French insurance company for what has been done.
B. To explain how a French insurance company works.
C. To tell brides and bridegrooms what to do before getting married.
D. To ask husband and wife-to-be to take out an insurance policy.

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The year which preceded my father’s death made great change in my life. I had been living in New Jersey, working defense plants, working and living among southerners, white and black. I knew about the south, of course, and about how southerners treated Negroes and how they expected them to behave, but it had never entered my mind that anyone would look at me and expect me to behave that way. I learned in New Jersey that to be a Negro meant, precisely, that one was never looked at but was simply at the mercy of the reflexes of the color of one’s skin caused in other people. I acted in New Jersey as I had always acted, that is as though I thought a great deal of myself-- I had to act that way -- with results that were, simply, unbelievable. I had scarcely arrived before I had earned the enmity, which was extrodinarily ingenious, of all my superiors and nearly all my co-workers. In the beginning, to make matters worse
A. not really that of the native born black Americans
B. that of the Frenchmen; the land refers to France
C. mine; yet it was occupied by Germans
D. mine; the land is that of the Americans

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