单选题While we don"t agree, we continue to be friends.

单选题According to Paul Kleihues, cancer was once regarded as

单选题A great deal has been done to {{U}}remedy{{/U}} the situation

单选题{{B}}第三篇{{/B}} {{B}}Is the News Believable?{{/B}} Unless you have gone through the experience yourself, or watched a loved one's struggle, you really have no idea just how desperate cancer can make you. You pray, you rage, you bargain with God, but most of all you clutch at any hope, no matter how remote, of a second chance at life. For a few excited days last week, however, it seemed as if the whole world was a cancer patient and that all humankind had been granted a reprieve (痛苦减轻). Triggered by a front-page medical news story in the usually reserved New York Times, all anybody was talking about — on the radio, on television, on the Internet, in phone calls to friends and relatives — was the report that a combination of two new drugs could, as the Times put it, "cure cancer in two years." In a matter of hours patients had jammed their doctors' phone lines begging for a chance to test the miracle cancer cure. Cancer scientists raced to the phones to make sure everyone knew about their research too, generating a new round of headlines. The time certainly seemed ripe for a breakthrough in cancer. Only last month scientists at the National Cancer Institute announced that they were halting a clinical trial of a drug called tamoxifen (他莫昔芬) — and offering it to patients getting the placebo (安慰剂) — because it had proved so effective at preventing breast cancer (although it also seemed to increase the risk of uterine (子宫的) cancer). Two weeks later came the New York Times' report that two new drugs can shrink tumors of every variety without any side effects whatsoever. It all seemed too good to be true, and of course it was. There are no miracle cancer drugs, at least not yet. At this stage all the drug manufacturer can offer is some very interesting molecules, and the only cancers they have cured so far have been in mice. BY the middle of last week, even the TV talk-show hosts who talked most about the news had learned what every scientist already knew: that curing a disease in lab animals is not the same as doing it in humans. "The history of cancer research has been a history of curing cancer in the mouse," Dr. Richard Klausner, head of the National Cancer Institute, told the Los Angeles Times. "We have cured mice of cancer for decades — and it simply didn't work in people."

单选题We"ve seen a marked shift in our approach to the social issues.

单选题For young children, getting dressed is a complicated business.

单选题Unlike the common cold, flu tends to start Uabruptly/U.

单选题It is {{U}}prudent{{/U}} to start any exercise program gradually at first. A. workable B. sensible C. possible D. feasible

单选题Numerous parallels exist between Ernest Hemingway's life and the lives of his characters. A. studies B. problems C. similarities D. biases

单选题He impressed all his colleagues as a vigorous man in the prime of his career. A. hot-tempered B. healthy C. friendly D. patient

单选题The rainfall of the Hawaiian Islands varies tremendously according to their topography and orientation to the prevailing winds.A. seasonablyB. surprisinglyC. greatlyD. inversely

单选题The story was very Utouchinq/U.

单选题Water Pollution The demand for freshwater rises continuously as the world's population grows. From 1940 to 1990, withdrawal of fresh water from rivers, lakes, reservoirs, and other sources has increased fourfold. Of the water consumed each year, 69 percent is used for agriculture, 23 percent for industry, and 8 percent for domestic uses. Sewage, industrial wastes, and agricultural chemicals such as fertilizers and pesticides are the main causes of water pollution. In 1995, the US Environmental Protection Agency (EPA) reported that about 37 percent of the country's lakes and estuaries, and 36 percent of its rivers. are too polluted for basic uses such as fishing or swimming, during all or part of the year. In developing nations, over 95 percent of urban sewage is discharged untreated into rivers and bays, creating a major human health hazard. Water runoff carries fertilizing chemicals such as phosphates and nitrates from agricultural fields and yards into lakes, streams, and rivers. These combine with the phosphates and nitrates from sewage to speed the growth of algae, a type of aquatic plant. The water body may then become choked with decaying algae, which severely depletes the oxygen supply. This process can cause the death of fish and other aquatic life. Runoff also carries toxic pesticides and urban and industrial wastes into lakes and streams. Erosion, the wearing away of topsoil by wind and rain, also contributes to water pollution. Soil and silt washed from logged hillsides, plowed fields, or construction sites, can clog waterways and kill aquatic vegetation. Even small amounts of silt can eliminate desirable fish species. " For example, when logging removes the protective plant cover from hillsides. rain may wash soil and silt into streams, covering the gravel beds that trout or salmon use for spawning. The marine fisheries supported by ocean ecosystems are an essential source of protein, particularly for people in developing countries; approximately 950 million people worldwide consume fish as their primary source of protein. Yet pollution in coastal bays, estuaries. and wetlands threatens fish stocks already depleted by overfishing. In 1989, 260,000 barrels of oil was spilled from the oil tanker Exxon Valdez into Alaska's Prince William Sound, a pristine and rich fishing ground. In 1992 there were 8,790 reported spills in and around US waters, involving 5.7 million liters (1.5 million gallons) of oil.

单选题The problem with normal flu vaccines is that influenza viruses are notorious "shapeshifters," says Dr. Jay Butler, director of the CDC's H1N1 Vaccine Task Force. They mutate (突变) rapidly and can even exchange genes with other strains of flu. However, federal officials knowfrom monitoring H1N1 in the Southern Hemisphere this summer that the virus has been unusually stable. Therefore the immune response generated by the vaccine should match the circulatingstrain of swine flu. "The vaccine will be effective," says Butler. Federal officials have found that H1N1 virusA. notorious "shape shifters".B. has been very stable.C. has mutated rapidly.D. has exchanged genes with other viruses.

单选题The flower bud of a water lily opens at sunset since its opening is triggered by the decreased light.A. alleviatedB. enduredC. set offD. covered up

单选题Many university courses are not really {{U}}geared{{/U}} to the needs of students or their future employers.

单选题Preserve the Environment Throughout history man has changed his physical environment in order to improve his way of life. With the tools of technology he has altered many physical features of the earth. He has transformed woodlands into farmland, and made lakes and reservoirs out of rivers for irrigation purposes or hydroelectric power. Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways. However, man's changes to the physical environment have not always had beneficial results. Today, pollution of the air and water is an increasing danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor vehicles; smoke from factories pollutes the air of industrialized areas and the surrounding areas of countryside. The air in cities is becoming increasingly unhealthy. The pollution of water is equally harmful. In the sea, pollution from oil is increasing and is killing enormous numbers of algae(水藻), fish and birds. The whole ecological balance of the sea is being changed. The same problem exists in rivers. Industrial wastes have already made many rivers lifeless. Conservationists believe that it is now necessary for man to limit the growth of technology in order to survive on earth.

单选题Happy Therapy (诊疗) Norman Cousins was a businessman from the United States who often traveled around the world on business. He enjoyed his work and traveling. Then, after returning to the United States from a busy and tiring trip to Russia, Mr. Cousins got sick. Because he had pushed his body to the limit of its strength on the trip, a chemical change began to take place inside him. The material between his bones became weak. In less than one week after his return, he could not stand. Every move that he made was painful. He was not able to sleep at night. The doctors told Mr. Cousins that they did not know how to cure his problems and he might never get over the illness. Mr. Cousins, however, refused to give up hope. Mr. Cousins thought that unhappy thoughts were causing bad chemical changes in his body. He did not want to take medicine to cure himself. Instead, he felt that happy thoughts or laughter might cure his illness. He began to experiment on himself while still in the hospital by watching funny shows on television. Mr. Cousins quickly found that ten minutes of real laughter during the day gave him two hours of pain-free sleep at night. Deciding that the doctors could not help him, Mr. Cousins left the hospital and checked into a hotel room where he could continue his experiments with laughter. For eight days, Mr. Cousins rested in the hotel room watching funny shows on television, reading funny books, and sleeping whenever he felt tired. Within three weeks, he felt well enough to take a vacation to Puerto Rico where he began running on the beach for exercise. After a few months, Mr. Cousins returned to work. He had laughed himself back to health.

单选题One Good Reason to Let Smallpox Live It"s now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it—one in the US and one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves? 1 reality, of course, it was naive to 2 that everyone would let 3 of such a potent potential weapon. Undoubtedly several nations still have 4 vials. 5 the last "official" stocks of live virus bred mistrust of the US and Russia, 6 no obvious gain. Now American researchers have 7 an animal model of the human disease, opening the 8 for tests on new treatments and vaccines. So once again there"s a good reason to 9 the virus—just in 10 the disease puts in a reappearance. How do we 11 with the mistrust of the US and Russia? 12 . Keep the virus 13 international auspices in a well-guarded UN laboratory that"s open to all countries. The US will object, of course, just at it rejects a multilateral approach to just about everything. But it doesn"t 14 the idea is wrong. If the virus 15 useful, then let"s make it the servant of all humanity—not just a part of it.

单选题Don't apply ice or butter or any other type of grease to burns. Also, don't cover a bum with a towel or blanket, because loose fibers might stick to the skin. When dealing with a serious burn, be careful not to break any blisters or pull off clothing stuck to the skin. Do wash and apply antibiotic (抗生素) ointment (软膏) to mild burns. Head to the hospital for any bums to the eyes, mouth, or genital (生殖器的) areas, even if mild; any burn that covers an area larger than your hand; and any bum that causes blisters or is followed by a fever. The paragraph centers onA. when to go to hospital.B. how to deal with bums.C. when antibiotic ointment is needed.D. how to use lee or butter to burns.