2010年考研英語二模擬試題及答案詳解(二)

　　SectionB

　　Directions: Reading the following text and answer questions by finding a subtitle for each of the marked parts or paragraphs. There are two extra items in the subtitle. Mark your answer on ANSWER SHEET . (10 points)

　　A. The consequence of losing bones

　　B. A better lab than on earth

　　C. Two different cases

　　D. Multiple effects form weightlessness

　　E. How to overcome weightlessness

　　F. Factors that are not so sure

　　During weightlessness, the forces within the body undergo dramatic change. Because the spine is no longer compressed, people grow taller. The lungs, heart and other organs within the chest have no weight, and as a result, the rib cage and chest relax and expand. Similarly, the weights of the liver, kidneys, stomach and bowels disappear. One astronaut said after his flight: “You feel your guts floating up. I found myself tightening my belly, sort of pushing things back�！�

　　41.

　　Meanwhile muscles and bones come to be used in different ways. Our muscles are designed to support us when stand or sit upright and to move body parts. But in space, muscles used for support on the ground are no longer needed for that purpose; moreover, the muscles used for movement around a capsule differ from those used for walking down a hall. Consequently, some muscles rapidly weaken. This doesn’t present a problem to space travelers as long as they perform only light work. But preventing the loss of muscle tissue required for heavy work during space walks and preserving muscle for safe return to Earth are the subject of many current experiments。

　　Studies have shown that astronauts lose bone mass from the lower spine, hips and upper leg at a rate of about 1 percent per month for the entire duration of their time in space. Some sites, such as the heel, lose calcium faster than others. Studies of animals taken into space suggest that bone formation also declines。

　　42.

　　Needless to say, these data are indeed cause for concern. During space flight, the loss of bone elevates calcium levels in the body, potentially causing kidney stones and calcium crystals to form in other tissues. Back on the ground, the loss of bone calcium stops within one month, but scientists do not yet know whether the bone recovers completely: too few people have flown in space for long periods. Some bone loss may be permanent, in which case ex-astronauts will always be more prone to broken bones。

　　43.

　　These questions mirror those in our understanding of how the body works here on Earth. For example, elderly women are prone to a loss of bone mass. Scientists understand that many different factors can be involved in this loss, but they do not yet know how the factors act and interact; this makes it difficult to develop an appropriate treatment. So it is with bone loss in space, where the right prescription still awaits discovery。

　　44.

　　Many other body systems are affected directly and indirectly. One example is the lung. Scientists have studied the lung in space and learned much they could not have learned in laboratories on earth. On the ground the top and bottom parts of the lung have different patterns of air flow and blood flow. But are these patterns the result only of gravity, or also of the nature of the lung itself? Only recently have studies in space provided clear evidence for the latter. Even in the absence of gravity, different parts of the lung have different levels of air flow and blood flow。

　　45.

　　Not everything that affects the body during space flight is related solely to weightlessness. Also affected, for example, are the immune system and the multiple systems responsible for the amount and quality of sleep(light levels and work schedules disrupt the body’s normal rhythms). Looking out the spacecraft window just before going to sleep(an action difficult to resist, considering the view) can let enough bright light into the eye to trigger just the wrong brain response, leading to poor sleep. As time goes on, the sleep debt accumulates。

　　For long space voyages, travelers must also face being confined in a tight volume, unable to escape, isolated from the normal life of Earth, living with a small, fixed group of companions who often come from different cultures. These challenges can lead to anxiety, depression, crew tension and other social issues, which affect astronauts just as much as weightlessness—perhaps even more. Because these factors operate at the same time the body is adapting to other environmental changes, it may not be clear which physiological changes result from which factors. Much work rem ains to be done。

　　PartⅢ Translation

　　Directions: Translate the following passage into Chinese and put your translation on the ANSWER SHEET。(15points)

　　The system of higher education in the United States is complex. It comprises four categories of institutions: the university, which may contain: A. several colleges for undergraduate students seeking a bachelor’s (four-year) degree and B. one or more graduate schools for those continuing in specialized studies beyond the bachelor’s degree to obtain a master or a doctoral degree; the four-year undergraduate institution—the college—most of which are not part of a university; the technical training institution， at which high school graduates may take courses ranging from six months to four years in duration and learn a wide variety of technical skills, from hair styling through business accounting to computer programming; and the two-year，or community college， from which students may enter many professions or may transfer to four-year colleges or universities。

　　Any of these institutions， in any category， might be either public or private， depending on the source of its funding. There is no clear or inevitable distinction in terms of quality of education offered between the institutions which are publicly or privately funded;however， this is not to say that all institutions enjoy equal prestige nor that there are no material differences among them。

　　PartⅣ Writing

　　Section A

　　Directions：假如你是湖北師范大學(xué)的校長王宏，你要給你校教師黃易寫一封推薦信，具體內(nèi)容如下：黃易自1995-1999年在你校英語系學(xué)習(xí)，在校學(xué)習(xí)期間成績優(yōu)秀并積極參加社會(huì)活動(dòng)，愛好文學(xué)和藝術(shù)。畢業(yè)后留校任教至今，深得學(xué)生好評(píng)。(10points)

　　Section B

　　Directions: You are asked to write a composition according to the outline givenbelow. Your composition should be not less than 120 words. You should write it clearly. (15points)

　　(1) 事業(yè)的成功與否離不開決心。

　　(2) 舉例說明成功的關(guān)鍵在于是否有恒心。

　　(3) 成功的另一因素——機(jī)遇同樣不可忽視。