单选题After the recent scandal, the priest is expected to do the ______ thing and resign from his position. A. reticent B. decent C. innocent D. descent

单选题Change—or the ability to adapt oneself to a changing environment—is essential to evolution. The farmer whose land is required for housing or industry must adapt himself: He can move to another place and master the problems peculiar to it; he can change his occupation, perhaps after a period of training; or he can starve to death. A nation which can not adapt its trade or defense requirements to meet world conditions faces economic or military disaster. Nothing is fixed and permanently stable. There must be movement forward, which is progress of a sort, or movement backwards, which is decay and deterioration. In this context, tradition can be a force for good or for evil. As long as it offers a guide(without insisting that its path is the only one), it helps the ignorant and the uninformed to take a step forward, and thereby, to adapt themselves to changed circumstances. Tradition, or custom, can guide the hunter as effectively as it can influence the nervous hostess. But if we make an idol(偶像、崇拜)of tradition, it ceases to become a guide and becomes an obstacle lying across the path of change and progress. If we insist on trying to plot the future by the past, we clearly handicap ourselves and invite failure. The better course is to adopt the help which tradition can give but, realizing that it necessarily has its roots in the past, to be well aware of its limitations in a changing world.

单选题I must remember ______ John that the garden needs watering.

单选题Today's college students have {{U}}ambiguous{{/U}} feelings about the role they should play in the world.

单选题Though he was born and brought up in America, he can speak ______ Chinese.

单选题Fossils of plant that have been extinct for fifty million years have been found inlarge deposits of amber near the Baltic Se

单选题One new______to learning a foreign language is to study the language in its cul tural context. A. approach B. solution C. manner D. road

单选题If you want this painkiller, you'll have to ask the doctor for a______.(2006年中南大学考博试题)

单选题One of the (more intriguing) theories about the destruction of Ur is his contention that the population (may destroy) their ziggurats and (abandoned) their metropolis in anger against the deities that permitted (so long) a famine.

单选题Can you imagine ! He offered me $ 5000 to break my contract. That's ______. Of course I didn't agree. I would take legal action.

单选题After our computer network ______for the third time that day, we all went home. A. crashed B. collided C. smashed D. fell

单选题Since the situation is changing, let's take some ______ measures to deal with it. A. available B. changeable C. flexible D. considerable

单选题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 recent energy crisis, new concepts for creating HDR recovery systems—which involve drilling holes and connecting them to artificial reservoirs placed deep within the crest—are being developed. In all attempts to retrieve energy from HDRs, artificial stimulation will be required to create either sufficient permeability or bounded flow paths to facilitate the removal of heat by circulation of a fluid over the surface of the rock. The HDR resource base is generally defined to include crustal rock that is hotter than 150℃, is at depths less than ten kilometers, and can be drilled with presently available equipment. Although wells deeper than ten kilometers are technically feasible, prevailing economic factors will obviously determine the commercial feasibility of wells at such depths. Rock temperatures as low as 100℃ may be useful for space heating; however, for producing electricity, temperatures greater than 200℃ are desirable. The geothermal gradient, which specifically determines the depth of drilling required to reach a desired temperature, is a major factor in the recoverability of geothermal resources. Temperature gradient maps generated from oil and gas well temperature-depth records kept by the American Association of Petroleum Geologists suggest that tappable high-temperature gradients are distributed all across the United States. (There are many areas, however, for which no temperature gradient records exist.) Indications are that the HDR resource base is very large. If an average geothermal temperature gradient of 22℃ per kilometer of depth is used, a staggering 13,000,000 quadrillion B.T.U. "s of total energy are calculated to be contained in crustal rock to a ten-kilometer depth in the United States. If we conservatively estimate that only about 0.2 percent is recoverable, we find a total of all the coal remaining in the United States. The remaining problem is to balance the economics of deeper, hotter, more costly wells and shallower, cooler, less expensive wells against the value of the final product, electricity and/or heat.

单选题There is scientific evidence to support our ______ that being surrounded by plants is good for health.

单选题In the summer of 999, Leif Erikson voyaged to Norway and spent the following winter with King Olaf Tryggvason. Substantially the same account is given by both the Saga of Eric the Red and the Flat Island Book. The latter says nothing about Leif's return voyage to Greenland, but according to the former it was during this return voyage that Leif discovered America. The Flat Island Book, however, tells of another and earlier landfall by Biarni, the son of a prominent man named Heriulf, and makes that the inspiration for the voyage to the new land by Leif. In brief, like Leif, Biarni and his companion sight three countries in succession before reaching Greenland, and to come upon each new land takes 1 "doegr" more than the last until Biarni comes to land directly in front of his father's house in the last- mentioned country. This narrative has been rejected by most later writers, and they may be justified. Possibly, Biarni was a companion of Leif when he voyaged from Norway to Greenland via America, or it may he that the entire tale is But a garbled account of that voyage and Biarni another name for Leif. It should be noted, however, that the stories of Leif's visit to King Olaf and Biarni's to that king's predecessor are in the same narrative in the Flat Island Book, so there is less likelihood of duplication than if they were from different sources. Also, Biarni landed on none of the lands he passed, but Leif apparently landed on one, for he brought back specimens of wheat, vines, and timber. Nor is there any good reason to believe that the first land visited by Biarni was Wineland. The first land was "level and covered with woods", and "there were small hillocks upon it'. Of forests, later writers do not emphasize them particularly in connection with Wineland, though they are often noted incidentally. And of hills, the Saga says of Wineland only that "wherever there was hilly ground, there were vines". Additionally, if the two narratives were taken from the same source we should expect a closer resemblance of Helluland. The Saga says of it: "They found there hellus (large flat stones)." According to the Biarni narrative, however, "this land was high and mountainous." The intervals of 1, 2, 3, and 4 "doegr" in both narratives are suggestive, but mythic formulas of this kind may be introduced into narratives without altogether destroying their historicity. It is also held against the Biarni narrative that its hero is made to come upon the coast of Greenland exactly in front of his father's home. But it should be recalled that Heriufsness lay below two high mountains which served as landmarks for navigators. I would give up Biarni more readily were it not that the story of Leif's voyage contained in the supposedly more reliable Saga is almost as amazing. But Leif's voyage across the entire width of the North Atlantic is said to be "probable" because it is incorporated into the narrative of a preferred authority, while Biarni's is "improbable" or even "impossible" because the document containing it has been condemned.

单选题After a run of several thousand years, it is entirely fitting that 2000 will be marked as the year the tide turned against taxation. Clay tablets recall the taxes of Hammurabi in the Babylon of 2000BC, but the practice is certainly older. People in power have always tried to divert some of the proceeds of economic activity in their own direction. Lords took feudal dues from their vassals; landowners took tolls from merchants; gangsters took protection money from small businesses; governments took taxes from their citizens. Despite the different names, the principle has remained constant: those who do not produce take resources from those who do, and spend it on altogether different things. The tide is turning because of the convergence of several factors, in the first place, taxes are becoming harder to collect. Capital is more mobile than ever, and inclined to fly from places that tax to places that do not. Governments do not move their boundaries and jurisdictions as rapidly as companies can change locations. Attempts to establish trans-national tax powers are almost certainly, ably doomed by international competition to attract economic activity. Many businesses will choose to stay out of reach. The global economy and the Internet mean that purchases can now cross frontiers. People buy books, clothes, and cars from abroad, and any finance minister who likes to tax these items find his tax base diminishing. It is not only capital and goods which are harder to pin down. Even wages are crossing frontiers. The rise of the service sector means that many income-generating activities can take place across frontiers, causing yet more headaches for overstretched public treasuries. Furthermore, the pace of electronic, hard-to-trace activity is accelerating. No less important has been the rise of political resistance. The past quarter-century has been marked by a movement led in Britain and America itself in California's famous tax-cutting referendum Proposition 13, but saw its fullest expression in the Thatcher and Reagan tax cuts of the 1980's. Britain's Tories entered office in 1979 with the top rate of income tax at 98%, and left office 18 years later with a top rate of 40%. Indeed, their Labour opponents became electable only after a firm promise not to raise it again. The plain fact is that electorates these days will not stand for it. They recognize, correctly, that governments spend their money less carefully and less efficiently than they can spend it themselves. One of the greatest uses of tax money is to provide pensions. And here a revolution--as important and pervasive as privatization--is sweeping the world. Fully-funded personal pension plans, based on individual savings, are sweeping away the poorly funded public pensions promised by governments. The latter take taxes from the young to support the old. The former invest savings from the young to support themselves when old.

单选题I seem to have reached a rather gloomy conclusion, but I think that something cheerful may still be______ from it.

单选题The research team decided to use an underwater saw to cut the ______ ship into sections before lifting it up.

单选题In order to help the students get a better understanding of the new conception, the professor it with many examples. A. enchanted B. dissipated C. eliminated D. illustrated