单选题Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But be recalls with special fondness a decidedly earthbound (为地球引力所束缚的) experience in the summer of 1980 when he participated in the NASA-ASEE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center"s propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seal could have led to destructive results for the astronauts who relied on them. "I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic (热力学的) analysis." At the end of the summer, he, like the other NASA-ASEE fellows working at Marshall, summarized his findings in a formal presentation and detailed paper. It was a valuable moment for Voss because the ASEE program gave him added understanding of NASA, deepened his desire to fly in space, and intensified his application for astronaut status. It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000. Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes a link with our colleges and universities," Voss explains. "There"s an exchange of information and an exchange of perspectives that is very important. " For the academic side, Voss says, the ASEE program also "brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real world problems and take it back to the classroom."

单选题Medical experts have (26) suspected a link between the health of the mind and the health of the body. From time to time researchers have reported (27) of much a link. One such report now comes from the University of California at San Diego School of Medicine. The study shows that the mental disorder known as depression (28) to harm the body's natural defense system against disease. (29) of severe depression generally have a low opinion of themselves. They often lose (30) in everything. They seem vary sad. They have trouble (31) . And they generally lose their (32) to eat. In most extreme examples, depressed persons (33) want to kill themselves. The University of California study was (34) by Dr. Michael Irwin. He began the study two years ago at a hospital in the city of Los Angeles. The study involved 37 women, (35) husbands were dying of lung cancer. Dr. Irwin studied the women for (36) of depression. He took some of their blood both before and after the death of their husbands. He examined the blood for (37) that help the body fight disease. These are the substances scientists call natural killer cells. T suppressor cells, and T helper cells. Dr. Irwin then looked for the same (38) of cells in the blood of women whose husbands (39) healthy. Dr. Irwin (40) that disease- fighting cells were not very active in the women whose husbands were dying or had just (41) . The rate of activity was (42) than in women whose husbands were healthy. Dr. Irwin also found that the rate of activity was (43) linked to the (44) of each woman's depression (45) the death of her husband.

单选题 {{B}}Text{{/B}} … The decrease{{U}} (8) {{/U}}blood pressure occurred{{U}} (9) {{/U}}race or{{U}} (10) {{/U}}and whether or not study participants are a "typical American diet",{{U}} (11) {{/U}}is high in saturated fats and contains few fruits and{{U}} (12) {{/U}}or the so-called DASH (for Dietary Approaches to Stop Hypertension)diet, which emphasizes lots of fresh{{U}} (13) {{/U}}, low-fat diary, fish and fewer sweets and which was proved in 1997 to reduce hypertension. The biggest decrease in blood pressure in this study was recorded in subjects who ate the DASH diet and reduced their sodium{{U}} (14) {{/U}}to 1 200mg a day. Why is this significant? {{U}}(15) {{/U}}-health experts estimate that Americans consume, on average, about 3 500 mg of sodium—{{U}} (16) {{/U}}about 9 grams of salt — daily. It' s not{{U}} (17) {{/U}}we' re that heavy-handed with the saltshaker. Most of our dietary sodium is added{{U}} (18) {{/U}}food processing. {{U}}(19) {{/U}}to 1 200mg, you'd have to forgo most{{U}} (20) {{/U}}foods, take-out deliveries and restaurant meals. So pay attention{{U}} (21) {{/U}}how much salt you' re eating, but don' t forget to make fruits, vegetables and whole grains a{{U}} (22) {{/U}}part of your diet. They' ll help{{U}} (23) {{/U}}your cholesterol level{{U}} (24) {{/U}}your blood pressure. Be sure to drink alcohol{{U}} (25) {{/U}}, if at all. {{U}}(26) {{/U}}weight—even just 4.5kg—and exercising at least 30 minutes most days of the week can also have a marked{{U}} (27) {{/U}}on blood pressure. …

单选题Onwhatdayoftheweekwillthemagazinearrive?

单选题The reforms that Horace Mann achieved ______.

单选题

单选题The way people hold to the belief that a fun-filled, pain-free life equals happiness actually reduces their chances of ever attaining real happiness. If fun and pleasure are equal to happiness, then pain must be equal to unhappiness. But in fact, the opposite is true: more often than not things that lead to happiness involve some pain. As a result, many people avoid the very attempts that are the source of true happiness. They fear the pain inevitably brought by such things as marriage, raising children, professional achievement, religious commitment, self-improvement. Ask a bachelor why he resists marriage even though he finds dating to be less and less satisfying. If he is honest he will tell you that he is afraid of making a commitment, for commitment is in fact quite painful. The single life is filled with fun, adventure, excitement. Marriage has such moments, but they are not its most distinguishing features. Couples with infant children are lucky to get a whole night's sleep or a three-day vacation. I don't know any parent who would choose the word "fun" to describe raising children. But couples who decide not to have children will never know the joys of watching a child grow up or of playing with a grandchild. Understanding and accepting that true happiness has nothing to do with fun is one of the most liberating realizations. It liberates time: now we can devote more hours to activities that can genuinely increase our happiness. It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless. And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all.

单选题

单选题{{I}} Questions 22 ～ 25 are based on the following story about how a homeless tramp became rich overnight.{{/I}}

单选题People have ______ today.

单选题The passage would most likely be found in a texbook on which of the following subjects?

单选题[此试题无题干]

单选题Whatistheaccident?[A]Aboyfellintotheriver.[B]Aboy'sbikeisbroken.[C]Aboywashitbyacar.

单选题

单选题 You will hear some dialogues or monologues. Before listening to each one, you will have time to read the questions related to it. While listening, answer each question by choosing A, B, C or D. After listening, you will have time to read your answer. You will hear each piece ONLY ONCE. Questions 11～14 are based on the following conversation.

单选题Whattimeoftheyeardoestheconversationtakeplace?