单选题The ______ meanings of the individual words do not help define all expressions like "Drop in any time. " A. literary B. literature C. literal D. literate

单选题Man has long wished to predict earthquakes. Recent findings indicate that reliable earthquake prediction is almost a reality. Before earthquakes occur, there frequently are changes in rock behavior that affect the velocities of other earthquake waves passing through the rocks. The former Soviet seismologists have used earthquake waves from other unrelated earthquakes to meas- ure the alterations in wave speed through rocks around a fault zone. For months to years before a particular earthquake, the former Soviet scientists observed that the strained rock in the fault zone was deformed in a way that slowed other earthquake wave that passed through the zone. Similar behavior has preceded earthquakes in California and New York. Changes in electrical resistance, water pressure l rock motion, and leakage of gas also can accompany the lowering of wave velocity. Fractures in the fault zone apparently open, which leads to a lowering of water pressure. When the fractures are filled by underground water, the continuing stress on the rocks is also exerted on the water in pores, which contributes to pressure within the rocks and ultimately causes further fault movement and earthquakes. These preliminary events have been observed and studied for many earthquakes. The larger the earthquake, apparently the longer the time during which the preliminary events take place. Careful observation and measurement of the early events will precede reliable forecasts. The preliminary events are most evident along normal and reverse fault systems, and strike-slip faults may not produce the same effect. Although earthquake forecasting is in its infancy, both American and the former Soviet scientists have been able to predict the occurrence of a few earthquakes. Understanding of the causes of earthquakes has opened several possibilities for their control. Underground nuclear explosions in Nevada have released strain energy stored in certain rocks. In some instances, the shock wave from the explosion has raised the strain on nearby fractures and faults enough to initiate fault movement. All of the resulting earthquakes have been small, but a large earthquake could conceivably be initiated. In the future, a situation may arise where it is desirable to deliberately initiate an earthquake near a heavily populated area because too large an amount of strain has accumulated on an active fault zone in the vicinity. If hazardous areas were left empty and if emergency services were standing at the ready, such action might be considered necessary to prevent a later much more damaging earthquake. However, the legal, environmental, and human problems would be large in- deed, perhaps too great for such action to be taken. Another possibility for earthquake control is much more exciting. Increasing water pressures can initiate faulting, as was unintentionally demonstrated by a deep well at the U. S. Army' s Rock Mountain Arsenal near Denver, Colorado, in the early 1960s. Disposal of nerve gas wastes in the well triggered movement along deeply buried inactive faults in the region. The liquid waste reduced frictional resistance along fault flat surface in the rocks surrounding the well, leading to movement along the faults. Earthquake activity in the area connected closely with the times of pumping of wastes into the disposal well, as was demonstrated convincingly by a Denver geologist, David Evans. Strain energy stored along the fault flat surface was apparently released by the fluid injection. Experiments by the U. S. Geological Survey in the Rangely oil field of northwestern Colorado have added to the experience gained from the study of the Denver earthquakes. The Survey geologists injected water in some of the Rangely wells, causing very small earthquakes. By withdrawing the water, the earthquakes were stopped. Although it is premature, many geologists believe we could eventually restrain earthquakes by injecting fluid into fault zones to permit slippage to take place gradually or in a series of small earthquakes. However, means must be found to control the areas affected and to be certain a major destructive quake is not initiated.

单选题4 Violin prodigies, I learned, have come in distinct waves from distinct regions. Most of the great performers in the late 19th and early 20th centuries were born and brought up in Russia and Eastern Europe. I asked Isaac Stern, one of the world's greatest violinists the reason for this phenomenon. "It is very clear," he told me. "They were all Jews (犹 太人) and Jews at the time were severely oppressed and ill-treated in that part of the world. They were not allowed into the professional fields, but they were allowed to achieve excellence on a concert stage. " As a result, every Jewish parent's dream was to have a child in the music school because it was a passport to the West. Another element in the emergence of prodigies, I found, is a society that values ex cellence in a certain field to nurture (培育) talent. Nowadays, the most nurturing societies seem to be in the Far East. "In Japan, a most competitive society, with stronger disci pline than ours. " says Isaac Stem, children are ready to test their limits every day in many fields, including music. When Western music came to Japan after World War Ⅱ , that mu sic not only became part of their daily lives, but it became a discipline as well. The Kore ans and Chinese as we know, are just as highly motivated as the Japanese. That's a good thing, because even prodigies must work hard. Next to hard work, bio logical inheritance plays an important role in the making of a prodigy. J. S. Bach, for exam ple, was the top of several generations of musicians, and four of his sons had significant careers in music.

单选题Ted got a better job and left the school before Mrs. Wolcox had him expelled. A. disgraced B. degraded C. executed D. ejected

单选题Some African Americans have had a profound impact on American society, changing many people"s views on race, history and politics. The following is a sampling of African Americans who have shaped society and the world with their spirit and their ideals. Muhammad Ali Cassius Marcellus Clay grew up a devout Baptist in Louisville, Kentucky, learning to fight at age 12 after a police officer suggested he learn to defend himself. Six years later, he was an Olympic boxing champion, going on to win three world heavyweight titles. He became known as much for his swagger (趾高气扬) outside the ring as his movement in it, converting to Islam in 1965, changing his name to Muhammad Ali and refusing to join the U.S. Army on religious grounds. Ali remained popular after his athletic career ended and he developed Parkinson"s disease, even lighting the Olympic torch at the 1996 Atlanta Olympics and conveying the peaceful virtues of Islam following the September 11 terrorist attacks. W. E. B. Du Bois Born William Edward Burghardt Du Bois in 1868, this Massachusetts native was one of the most prominent, prolific intellectuals of his time. An academic, activist and historian, Du Bois co-founded the National Association for the Advancement of Colored People (NAACP), edited "The Crisis" magazine and wrote 17 books, four journals and many other scholarly articles. In perhaps his most famous work, "The Souls of Black Folk", published in 1903, he predicted "the problem of 20th century [would be] the problem of the color-line". Martin Luther King Jr. The Rev. Martin Luther King Jr. is considered one of the most powerful and popular leaders of the American civil rights movement. He spearheaded (带头,作先 锋)a massive, nonviolent initiative of marches, sit-ins, boycotts and demonstrations that profoundly affected Americans" attitudes toward race relations. He was awarded the Nobel Peace Prize in 1964. Malcolm X Black leader Malcolm X spoke out about the concepts of race pride and black nationalism in the early 1960s. He denounced the exploitation of black people by whites and developed a large and dedicated following, which continued even after his death in 1965. Interest in the leader surged again after Spike Lee"s 1992 movie "Malcolm X" was released. Jackie Robinson In 1947, Jackie Robinson broke the color barrier by joining the Brooklyn Dodgers, becoming the first black baseball player in the U.S. major leagues. After retirement from baseball in 1957, he remained active in civil rights and youth activities. In 1962, he became the first African-American to be inducted into the Baseball Hall of Fame.

单选题Peter took the ______ in clearing up the mess, and the other boys followed his example.

单选题When the pacific War broke out, Edward was {{U}}drafted{{/U}} by navy and served four full years on a big aircraft carrier.

单选题The boy had a{{U}} violent {{/U}}pain in his stomach after eating too much ice-cream.

单选题The each {{U}}revolves {{/U}}both round the sun and on its own axis.

单选题Before the disastrous earthquake there was ______ chaos.

单选题His classes were packed and students, responding to the warmth of his personality and the ______of his lectures, would cluster round him before and after the class to bombard him with questions.

单选题You could be ______ many dangers by traveling alone in that area. A. subject to B. immune to C. sensitive to D. resistant to

单选题William never lends himself to ______ at cards.

单选题Her office in the First National Bank building is provisional .

单选题He always has a lot of______ ideas in his mind, and sometimes we do not even know what he is thinking about.(2011年南京师范大学考博试题)

单选题The qualities of my home town, ______ on me as a boy, had a profound effect on the philosophy that directed my career.

单选题This crop does not do well in soils______the one for which it has been speciaIly developed.

单选题______all living things have some way of getting from here to there.

单选题The lady dressed in the latest Paris fashion is ______ in her appearance but rude in her speech.

单选题Obesity generally is defined as an accumulation of fat(adipose tissue) beyond what is considered normal for a person's age, sex, and body type. In today's society obesity is considered as a disease, not a moral failing. It occurs when energy intake exceeds the amount of energy expended over time. Only in a small minority of cases is obesity caused by such illnesses as hypothyroidism, or the result of taking medications, such as steroids, that can cause weight gain. The more a person weighs, the more blood vessels the body needs to circulate blood throughout the body. The heart takes on a heavy burden as it has to pump harder to force the blood flow through so many vessels, As a result, the heart grows in size and blood pressure tends to rise. Obesity is also a factor in osteoarthritis (because of the extra weight placed on joints), gout, bone and joint diseases(including ruptured intervertebral discs), varicose veins, respiratory ailments; gallbladder disease, complications during pregnancy and delivery, and higher accidental death rate. Obesity can alter hormone levels, affect immune function, and cause impotence in men and reproductive problems in women. Women who are 30% overweight are twice as likely to die of endometrial cancer, and those who are 40% overweight have four times the risk. Obese women also are more likely to incur cancers of the breast, cervix, ovaries, and gallbladder. Obese men are more likely to develop cancers of the rectum, colon, esophagus, bladder, pancreas, stomach, and prostate. Obesity can also cause psychological problems. Sufferers are associated with laziness, failure, or inadequate willpower. As a result, overweight men and women blame themselves for being heavy, thus causing feelings of guilt and depression. Scientific evidence has found an association between MBI(body-mass index) and higher death rates. However, the relative risk of being heavy declines with age. Some researchers have found that data linking overweight and death are inconclusive, while other researchers have found that losing weight may be riskier than dangers posed by extra pounds. Some researchers counter that overweight indirectly contributes to over 300,000 deaths a year. A poll by Shape Up America found that 78% of overweight or obese adults have abandoned dieting as a means of losing weight. Diets do not teach people how to eat properly. They merely restrict food intake temporarily, so when the diet ends, weight gain r