单选题Malaria is an infectious parasitic disease that can be either acute or chronic and is frequently A.repeating B.terminal C.debilitating D.recurrent

单选题Biology may not be destiny, but genes apparently have a far greater influence on human behavior than is commonly thought. Similarities ranging from phobias to hobbies to bodily gestures are being found in pairs of twins separated at birth. Professor Bouchard of the University of Minnesota reports that so far, exhaustive psychological tests and questionnaires have been completed with approximately 50 pairs of identical twins reared apart, 25 pairs of fraternal twins reared apart, and comparison groups of twins reared together. Studies show that twins rend to have similar mannerisms, gestures, speed and tempo in talking, habits and jokes. Many of the twins dressed in similar fashion. One pair had practically the same items in the toilet cases, including the same brand of cologne and a Swedish brand of toothpaste. Twins also tend to have similar hobbies and interests—a male pair had similar workshops in their basements and a female pair had strikingly similar kitchen arrangements. Bouchard doesn't have enough information on abnormal behavior or psychopathology to make generalizations, but he has found repeated similarities. One pair of women were both very superstitious; another pair would burst into tears at the drop of a hat, and questioning revealed that both had done so since childhood. Overall the emerging findings of the study constitute a powerful rebuttal to those who maintain that environmental influences are primary shaping forces of personality. The textbooks are going to have to be rewritten, Bouchard predicts.

单选题Two-thirds of the U.S. basketball players are black, and the number would be greater______.the continuing practice of picking white bench warmers for the sake of bal ance. A. was it not because of B. had it not been for C. were it not for D. would it not have been for

单选题This is a market in which enterprising businesses ______ for the demands of teenagers and older youths in all their rock mania and pop-art forms. A. cater B. entitle C. appeal D. subject

单选题Which of the following is not mentioned in the passage?

单选题The transgenic farm animals mentioned in this passage are ______.

单选题Hong Kong was not a target for terror attacks, the Government insisted yesterday, as the US ______ closed for an apparent security review.

单选题This is a very big hotel and it can ______more than 1,000 people.(2011年南京师范大学考博试题)

单选题These people actively try to______ what they believe to be bad English and assiduously cultivate what they hope to be good English.(2004年中国社会科学院考博试题)

单选题It was so (disgusted), and (somewhat hazardous), (not to mention) a huge hassle and (monetary expense).

单选题We need one hundred more signatures before we take the ______ to the governor. A. plea B. petition C. patent D. claim

单选题Make up your mind that whatever the short-term temptations may be, you will never ______ from the highest standards of honor. A. deviate B. escape C. derive D. refrain

单选题The geology of the Earth"s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves, transports, and precipitates many chemical compounds and is constantly modifying the face of the Earth. Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks, streams, and rivers, constituting what is called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level. The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs--atmosphere, continent, and ocean--we see that the times are very different. A water molecule stays, on an average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents. A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.

单选题Forget football. At many high schools, the fiercest competition is between Coke and Pepsi over exclusive "pouring rights" to sell on campus. But last week Jeffrey Dunn, president of Coca-Cola Americas, called a timeout: Coke's machines will now also stock water, juice, and other healthful options--even rival brands and their facades will feature school scenes and other "noncommercial graphics" instead of Coke's vivid red logo. "the pendulum needs to swing back" on school-based marketing, said Dunn. Coke's about-face--particularly the call to end the exclusive deals that bottlers make with school districts--comes amid rising concern over kids' health: American children are growing ever more obese and developing weight-related diseases usually found in adults. While inactivity and huge helpings factor heavily, a recent study in the Lancet fingered soda pop as a likely culprit. Communities--and legislators--are already on the case. Last year, for instance, parents in Philadelphia detailed a proposed contract with Coca-Cola that would have netted the school system $ 43 million over 10 years. And in a searing' report to congress last month, the U. S. Department of Agriculture recommended that all snacks sold in schools meet federal nutrition standards (the requirements are loose enough that Snickers bars qualify). Spare change? Activists hope Coke's capitulation will help curb commercialism in schools altogether. From ads on Channel One, which broadcasts current-affairs programs on classroom TV, to middle-school math texts that cite Nike and other bran-name products in their word problems, to company-sponsored scoreboards on football fields, American pupils are bombarded. But Andrew Hagelshaw, executive director of the Oakland, Calif.-based Center for Commercial-Free Public Education, views Coca-Cola's policy shift as a "partial victory". Schools sign contracts with local bottlers; the parent company can only urge them to back off. Moreover, Coke's machines will remain in place, although with healthier options. And don't expect teenagers to suddenly swear off the stuff--or school districts to give up the revenue. At Wheeler High School in Marietta, Ga., where students arrive before 7 a.m. and stay as late as 11 o'clock at night, they rely on the machines. And the $ 50,000 in annual vending revenues have enabled Principal Joe Boland to refinish the gym floor, in- stall a new high-jump pit, and pay $ 7,000 for two buses. "If someone made an offer to me to take the machines out, I'd consider it," says Boland. "But nobody's offering me any money./

单选题I think it is high time we ______ the fact that environmental pollution in this area is getting more serious than before.