单选题Part of his general thrift is to be meticulous in verifying monthly expenses.

单选题What do we usually think of our normal behavior?

单选题The defence lawyer was questioning the old man who was one of the______of the murder committed last month.

单选题On that bitterly cold winter night, few people walked along the______narrow streets.

单选题Diamonds are usually cut to bring out their natural luster and to remove any Uflaws/U.

单选题As the fat man sat down, the folding chair______under him, with a loud noise of tearing canvas.

单选题{{B}}Directions:{{/B}} There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and then mark the corresponding letter on the ANSWER SHEET with a single line through the center. A scorching sun, an endless sea of sand and a waterless, forbiddingly lonely land--that is the image most people have of deserts. But how true is this picture? Deserts are drylands where rainfall is low. This is not to say rain never falls in deserts. It may fall once or twice a year in a fierce torrent that fades almost as soon as it has begun, or which evaporates in the hot air long before it has got anywhere near the earth. It may fall in a sudden sweeping flood that carries everything in its path. Rains may only come once in five or six years or not fall for a decade or more. The Mojave desert in the United States remained dry for twenty-five years. Without water no living thing can survive, and one feature of the desert landscape is the absence of vegetation. With little rain and hardly any vegetation the land suffers under the sun. There are virtually no clouds or trees to protect the earth's surface and it can be burning hot. Under the sun, soils break up and crack. Wind and torrential rain sweep away and erode the surface further. Eight million square kilometers of the world's land surface is desert. Throughout history deserts have been expanding and retreating again. Cave paintings show that parts of the Sahara Desert were green and fertile about 10, 000 years ago, and even animals like elephants and giraffes roamed the land. Fossil and dunes found in fertile and damp parts of the world show that these areas were once deserts. But now the creation of new desert areas is happening on a colossal scale. Twenty million square kilometers, an area twice the size of Canada, is at a high to very high risk of becoming desert. With a further 1.25 million square kilometers under moderate risk, an area covering 30% of the earth's land surface is desert, becoming desert, or in danger of becoming desert. The rate of growth of deserts is alarming. The world's drylands which are under threat include some of the most important stock-rearing and wheat-growing areas and are the homes of 600 - 700 million people. These regions are becoming deserts at the rate of more than 58, 000 square kilometers a year or 44 hectares a minute. In North Africa at least 100, 000 hectares of cropland are lost each year. At this rate there is a high risk that we will be confined to living on only 50% of this planet's land surface within one more century unless we are able to do something about it.

单选题The nuclear age in which the human race is living, and may soon be dying, began for the general public with the dropping of an atom bomb on Hiroshima on 6 August 1945. But for nuclear scientists and for certain American authorities, it had been known for some time that such a weapon was possible. Work towards making it had been begun by the United States, Canada and Britain very soon after the beginning of the Second World War. The existence of possibly explosive forces in the nuclei of atoms had been known ever since the structure of atoms was discovered by Rutherford. An atom consists of a tiny core called the "nucleus" with attendant electrons circling round it. The hydrogen atom, which is the simplest and lightest, has only one electron. Heavier atoms have more and more as they go up the scale. The first discovery that had to do with what goes on in nuclei was radioactivity, which is caused by particles being shot out of the nucleus. It was known that a great deal of energy is locked up in the nucleus, but, until just before the outbreak of the Second World War, there was no way of releasing this energy in any large quantity. A revolutionary discovery was that, in certain circumstances, mass can be transformed into energy in accordance with Einstein"s formula which states that the energy generated is equal to the mass lost multiplied by the square of the velocity of light. The A-bomb, however, used a different process, depending upon radioactivity. In this process, called "fission", a heavier atom splits into two lighter atoms. In general, in radioactive substances this fission proceeds at a constant rate which is slow where substances occurring in nature are concerned. But there is one form of uranium called "U235" which, when it is pure, sets up a chain reaction which spreads like fire, though with enormously greater rapidity. It is this substance which was used in making the atom bomb. The political background of the atomic scientists" work was the determination to defeat the Nazis. It was held--I think rightly--that a Nazi victory would be an appalling disaster. It was also held, in Western countries, that German scientists must be well advanced towards making an A-bomb, and that if they succeeded before the West did they would probably win the war. When the war was over, it was discovered, to the complete astonishment of both American and British scientists, that the Germans were nowhere near success, and as everybody knows, the Germans were defeated before any nuclear weapons had been made. But I do not think that nuclear scientists of the West can be blamed for thinking the work urgent and necessary. Even Einstein favored it. When, however, the German war was finished, the great majority of those scientists who had collaborated towards making the A-bomb considered that it should not be used against the Japanese, who were already on the verge of defeat and, in any case, did not constitute such a menace to the world as Hitler. Many of them made urgent representations to the American Government advocating that, instead of using the bomb as a weapon of war, they should after a public announcement, explode it in a desert, and that future control of nuclear energy should be placed in the hands of an international authority. Seven of the most eminent of nuclear scientists drew up what is known as "The Franck Report" which they presented to the Secretary of War in June 1945. This is a very admirable and far-seeing document, and if it had won the assent of the politicians, none of our subsequent terrors would have arisen.

单选题[此试题无题干]

单选题The criticism from the public has ______ this novel. A. eclipsed B. avenged C. baffled D. broadened

单选题The phrase "on the brink of a boom" (in boldface in Paragraph 2) in the context means ______.

单选题______ near-perfect English language skills, the students were keen to explore every aspect of Australian culture, from Aussie eating customs to family and student life, popular culture, the natural landscape and the ever-popular Australian native animals. A. Possessing B. Acquiring C. Apprehending D. Interpreting

单选题There is a direct flight at 3:00 or a flight 7:30 in the morning that ______ in Los Angles. A. stops by B. stop in C. stops over D. stops up

单选题Probably Tondo's rage was due to the fact that ______.

单选题My seven-year-old nephew had a pair of new shoes in April and he"s already ______ them.

单选题The word "they" in paragraph 5 refers to ______ .

单选题When the A(concentration) of calcium in the blood is B(too) low, the parathyroid glands C(began) to D(secrete) the hormone parathormone.

单选题Switzerland is A best known for its B majesty mountain range and C thousands flock to the Alps each year to take advantage of D their ideal skiing conditions.