单选题Which of the following causes concerns of the public and the scientists?

单选题Why dont you bring ______ to his attention that you are too busy to do it? A) this B) what C) that D) it

单选题Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests. A. when B. while C. as D. after

单选题Even if they are on sale, these refrigerators are equal in price to, ff not more expensive than, ______at the other store.A. anyoneB. the othersC. thatD. the ones

单选题The government-run command post in Tunis is staffed around the clock by military personnel, meteorologists and civilians. On the wall are maps, crisscrossed with brightly colored arrows that painstakingly track the fearsome path of the enemy. What kind of invader gives rise to such high-level monitoring? Not man, not beast, but the lowly desert locust(蝗虫). In recent moths, billions of the 3-inch-long winged warriors have descended on Algeria, Libya, Morocco and Tunisia, blackening the sky and eating up crops and vegetation. The insect invasion, the worst in 30 years, is already creating great destruction in the Middle East and is now treating southern Europe. The current crisis began in late 1985 near the Red Sea. Unusually rainy weather moistened the sands of the Sudan, making them ideal breeding grounds for the locust, which lays its eggs in the earth. The insect onslaught threatens to create yet another African famine. Each locust can eat its weight(not quite a tenth of an ounce)in vegetation every 24 hours. A good-size swarm of 50 billion insects eats up 100, 000 tons of grass, trees and crops in a single night. All $ 150 million may be needed this year. The U. S. has provided two spraying planes and about 50,000 gal. of pesticide. The European Community has donated $3.8 million in aid and the Soviet Union, Canada, Japan and China have provided chemical-spraying aircraft to help wipe out the pests. But relief efforts are hampered by the relative mildness of approved pesticides, which quickly lose their deadly punch and require frequent replications. The most effective locust killer Dieldrin has been linked to cancer and is banned by many Western countries and some of the affected African nations. More than 5 million acres have been dusted with locust-killing chemicals; another 5 million will be treated by the end of June. On May 30, representatives of Tunisia, Algeria, Libya, Morocco and Mauritania will meet in Algiers to discuss tactics to wipe out the ravenous swarms. The move is an important step, but whatever plan is devised, the locust plague promised to get worse before the insects can be brought under control.

单选题Your firm has been kindly ______ to us by your sister firm. A．recommended B．commended C．mended D．demanded

单选题The increase in student number______many problems for the universities.

单选题Lateral thinking (迂回思维), first described by Edward de Bono in 1967, is just a few years older than Edward"s son. You might imagine that Caspar was raised to be an adventurous thinker, but the de Bono was so famous, Caspar"s parents worried that any time he would say something bright at school, his teachers might snap, "Where do you get that idea from?" "We had to be careful and not overdo it," Edward admits. Now Caspar is at Oxford which once looked unlikely because he is also slightly dyslexic (诵读困难). In fact, when he was applying to Oxford, none of his school teachers thought he had a chance. "So then we did several thinking sessions," his father says, "using my techniques and when he went up for the exam, he did extremely well." Soon after, Edward de Bono decided to write his latest book "Teach Your Child How to Think", in which he transforms the thinking skills he developed for brain-storming businessmen into informal exercises for parents and children to share. Thinking is traditionally regarded as something executed in a logical sequence, and everybody knows that children are not very logical. So isn"t it an uphill battle, trying to teach them to think? "You know," Edward de Bono says, "if you examine people"s thinking, it is quite unusual to find faults of logic. But the faults of perception are huge! Often we think ineffectively because we take too limited a view." "Teach Your Child How to Think" offers lessons in perception improvement, of clearly seeing the implications of something you are saying and of exploring the alternatives.

单选题Obesity is an epidemic to some and an opportunity to others. More than two-thirds of Americans are overweight. Find a way to battle obesity, 1 a huge profit might be made. On February 22nd, 2013 one pharmaceutical firm, Virus, took a small 2 towards this goal. A committee advising America"s Food and Drug Administration (FDA) recommended Vivus"s diet drug, Qnexa. 3 , the pill"s long-awaited final approval may not come until April. The announcement mostly served as a reminder of a struggle which 4 fat into gold. Medical-device and pharmaceutical companies are quite 5 treating the problems that come with obesity. However, they can"t help consumers 6 weight. Allergan, a device-maker, has tried to use its gastric bands to enter the obesity market. The band is fitted near the top of patients" stomach, which helps them feel full 7 during the meal. Allergan has captured about 70% of the worldwide market for gastric bands, but sales are now 8 . The recession has sapped consumers" desire for expensive surgery. Some patients have 9 bands removed because they slipped or proved 10 . In January David Pyott, Allergan"s chief executive, said he would cancel an effort to market the band for teenagers. He is now trying to convince insurers of the gastric band"s 11 . Drug companies have had even more 12 than device-makers. It has been 13 years since the FDA approved a 13 diet pill. That drug, Roche"s Xenical, has 14 side-effects. The FDA rejected Vivus"s Qnexa in 2010 over 15 for the safety of pregnant women and the quickening of patients" heart rates. However, Vivus"s new data in 2013 apparently satisfied the FDA"s advisory committee. But the agency may yet 16 the drug. 17 Qnexa is approved, it is unclear that patients will buy it. Qnexa 18 two medicines that are already on the market. Both medicines are generic, which means that doctors may 19 the existing drugs rather than Qnexa"s more expensive version. For now, it is more 20 to treat fat patients than to try to make them slim.

单选题The new president is reported______China after he takes office in the capital.

单选题Convincing the public to follow health advice can be tough and time-consuming. This may be why changes to health messages are often fiercely resisted by those whose job is to get the advice across. So, for example, the suggestion that smokers who cannot quit should reduce their exposure to harm by switching to chewing tobacco met with extreme opposition. A still more ferocious debate is emerging over the health impact of sunshine. For the past 20 years, advice on sunlight has come from dermatologists who rightly warn people to cover up when they venture outside for fear of developing skin cancer. But evidence from researchers in other fields now suggests that short periods in the sun without protection—sometimes as little as a few minutes a day—can prevent most other major forms of cancer. This surprising conclusion stems from findings that vitamin D, which is made by skin cells exposed to the sun" s ultraviolet rays, is a potent anti-cancer agent. The researchers who made this discovery are eager to be heard. But their message is about as welcome as a bad rash, particularly in countries such as Australia and the US where fair-skinned immigrants living at Mediterranean latitudes have made skin cancer a huge problem. The American Academy of Dermatology argues that advocating one carcinogen—UV radiation—to protect against other forms of cancer is dangerous and misleading. If people need more vitamin D, they should take a multivitamin or drink milk fortified with it, says the academy. Unfortunately , the solution is not as simple as that. Critics also argue that the protective effect of sunlight is not yet proved. While this may be true, the evidence is very suggestive. The case is built on several studies that bring together cellular biology, biochemistry and epidemiology. And all the criticism of this theory counts for nothing if, as some of its advocates, suggest, the number of people dying for lack of sunlight is four times as high as those dying from skin cancer. At the same time, those advocates must not overstate their case. Everyone wants to save as many lives as they can. What we need now is for national medical research bodies and cancer research organizations to investigate the relative risks and benefits of sunshine. This will almost certainly mean more epidemiological work, which should start as soon as possible. As for the public: give them the facts, including risk estimates for short periods in the sun—and for covering up, It is patronizing(施恩于人的)to assume that people cannot deal with complex messages. What we definitely do not want is a war of words between groups with polarized views, and no prospect of the issue being resolved. That way will only lead to confusion, distrust of doctors and more unnecessary deaths.

单选题"Bob certainly has a low opinion of Sue. " "It can't be any worse than ______ of him. " A. her B. hers C. she D. she does

单选题Many new words have been added to the English language in the past forty years; and since Shakespeare's time' the number of words in the language has increased more than five times, from about 140,000 to ______ between 700,000 and 800,000. A. somehow B. somewhere C. whereas D. somewhat

单选题The boat was nearly turned ______ by the gale. A． over B． down C． off D． out

单选题Bob fails to attend the evening school. He______ sick, because he never asks for leave.(2014年厦门大学考博试题)

单选题Now Tom together with his classmates ______ football on the playground. A) play B) are playing C) plays D) is playing