单选题If the batik's statement agrees with my bank balance, it does not follow indisputably that the balance is correct.

单选题Growth, reproduction, and daily metabolism all require an organism to expend energy. The expenditure of energy is essentially a process of budgeting, just as finances are budgeted. If all of one's money is spent on clothes, mere may be none left to buy food or go to the movies. Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction. All organisms, therefore, allocate energy to growth, reproduction, maintenance, and storage. No choice is involved; this allocation comes as part of the genetic package from the parents. Maintenance for a given body design of an organism is relatively constant. Storage is important, but ultimately that energy will be used for maintenance, reproduction, or growth. Therefore the principal differences in energy allocation are likely to be between growth and reproduction. Almost all of an organism's energy can be diverted to reproduction, with very little allocated to building the body. Organisms at this extreme are " opportunists." At the other extreme are "competitors", almost all of whose resources are invested in building a huge body, with a bare minimum allocated to reproduction. Dandelions are good examples of opportunists. Their seed heads raised just high enough above the ground to catch the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water content. Thus, a minimum investment has been made in the body that becomes a platform for seed dispersal. These very short-lived plants reproduce prolifically; that is to say they provide a constant rain of seed in the neighborhood of parent plants. A new plant will spring up wherever a seed falls on a suitable soil surface, but because they do not build big bodies, they cannot compete with other plants for space, water, or sunlight. These plants are termed opportunists because they rely on their seeds' falling into settings where competing plants have been removed by natural processes, such as along an eroding riverbank, on landslips, or where a tree falls and creates a gap in the forest canopy. Opportunists must constantly invade new areas to compensate for being displaced by more competitive species. Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists. Hence, many of the strongly opportunistic plants are the common weeds of fields and gardens. Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods. If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles. The opposite of an opportunist is a competitor. These organisms tend to have big bodies, are long-lived, and spend relatively little effort each year on reproduction. An oak tree is a good example of a competitor. A massive oak claims its ground for 200 years or more, outcompeting all other would-be canopy trees by casting a dense shade and drawing up any free water in the soil. The leaves of an oak tree taste foul because they are rich in tannins, a chemical that renders them distasteful or indigestible to many organisms. The tannins are part of the defense mechanism that is essential to longevity. Although oaks produce thousands of acoms, the investment in a crop of acorns is small compared with the energy spent on building leaves, trunk, and roots. Once an oak tree becomes established, it is likely to survive minor cycles of drought and even fire. A population of oaks is likely to be relatively stable through time, and its survival is likely to depend more on its ability to withstand the pressures of competition or predation than on its ability to take advantage of chance events. It should be noted, however, that the pure opportunist or pure competitor is rare in nature, as most species fall between the extremes of a continuum, exhibiting a blend of some opportunistic and some competitive characteristics.

单选题The ______ of medical knowledge is being pushed farther onwards as time goes on. A. potential B. multitude C. frontier D. leap

单选题The advantage of these contracts is that if property is destroyed by a peril not specifically excluded the insurance is good. A. mishap B. wreck C. hazard D. collision

单选题Though he was born and brought up in America, he can speak ______ Chinese. (2013年厦门大学考博试题)

单选题The author is strongly opposed to the practice of examinations at schools because ______.

单选题The author's primary purpose in the passage is to ______.

单选题It is the first of several agreements the United States hopes to reach as it attempts to reduce labor costs by $ 5.8 billion and ______ bankruptcy. A. dispel B. revert C. transfer D. avert

单选题According to the statistics of the 1980s, which of the following is NOT true?

单选题By the time I reached my residency, I ______ treating the patient as a whole human being.

单选题Mr. Johnson was a passionate person filled with an incredible Udynamism/U.

单选题It is unwise for the government to ______ the growing dissatisfaction with its economic policies.

单选题Duke Ellington' s______ orchestration techniques made him perhaps the most remarkable artist that jazz has produced.

单选题Human-centered, or anthropocentric, views favor an instrumental view of the natural world and value it only as a means to human ends. Such views place great value and trust in science and technology, believing that the powers of control over nature conferred by them are non-problematical and that ongoing technical development will be crucial to ensure a world bereft of poverty, drudgery and disease etc. A. favor an instrumental B. a means to human ends C. conferred by them D. will be crucial to ensure

单选题When they advise your kids to "get an education" if you want to raise your income, they tell you only half the truth. What they really mean is to get just enough education to provide man power for your society, but not too much that you prove an embarrassment to your society. Get a high school diploma, at least. Without that, you are occupationally dead, unless your name happens to be George Bernard Shaw or Thomas Alva Edison and you can successfully drop out in grade school. Get a college degree, if possible. With a B. A., you are on the launching pad. But now you have to start to put on the brakes. If you go for a master's degree, make sure it is an MBA, and only from a first-rate university. Beyond this, the famous law of diminishing returns begins to take effect. Do you know, for instance, that long-haul truck drivers earn more a year than full professors? Yes, the average 1977 salary for those truckers was $24,000, while the full professors managed to average just $23,930. A Ph.D is the highest degree you can get, but except in a few specialized fields such as physics or chemistry, where the degree can quickly be turned to industrial or commercial purposes, you are facing a dim future. There are more Ph.Ds unemployed or underemployed in this country than in any other part of the world by far. If you become a doctor of philosophy in English or history or anthropology or political science or languages or—worst of all — in philosophy, you run the risk of becoming overeducated for our national demands. Not for our needs, mind you, but for our demands. Thousands of Ph.Ds are selling shoes, driving cabs, waiting on tables and filling out fruitless applications month after month. And then maybe taking a job in some high school or backwater college that pays much less than the janitor earns. You can equate the level of income with the level of education only so far. Far enough, that is, to make you useful to the gross national product, but not so far that nobody can turn much of a profit on you.

单选题With technological developments, some labor-intensive industries have ______ high-tech industries.

单选题At dusk, Mr. Hightower would sit in his old armchair in the backyard and wistfully lose in reminiscence of his youth romances.

单选题In 1816, an apparently insignificant event in a remote part of Northern Europe______ Europe into a bloody war.(2005年清华大学考博试题)

单选题His originality as a composer is____by the following group of songs.

单选题Tom is ordered to be present at the important meeting,______. A. rain or shine B. more or less C. sooner or later D. for good