61. This passage mainly deals with [A]the differences of children in their learning capabilities [B]the definition of exceptional children in modern society [C]the special educational programs for exceptional children [D] the necessity of adapting education to exceptional children 62. From this passage we learn that the educational concern for exceptional children [A] is now enjoying legal support B disagrees with the tradition of the country [C] was clearly stated by the country's founder [ D] will exert great influence over court decisions Passage 4 I have great confidence that by the end of the decade we 'll know in vast detail how cancer cells arise, "says microbiologist Robert Weinberg, an expert on cancer. But, he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur, he discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years. In the year 2000 the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistics are still discouraging 13 percent for lung cancer, and 2 percent for cancer of the pancrea With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes, are inactive in normal cells. Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers. " Changes are a normal part of the evolutionary process, says oncologist William Hayward, Environmental factors can never be totally eliminated; as Hayward points out, " We can't prepare a medicine against cosmic rays The prospects for cure, though still distant, are brighte First. we need to understand how the normal cell controls itself. Second we have to determine whether there are a mited number of genes in cells which are al-ways responsible for at least part of the trouble If we can understand how cancer works we can counteract its action 63. The example of Pasteur in the passage is used to [A] predict that the secret of cancer will be disclosed in a decade [B]indicate that the prospects for curing cancer are bright IC] prove that cancer will be cured in fifty to sixty years [ D] warn that there is still a long way to go before cancer can be conquered 4. The author implies that by the year 2000, 33 61. This passage mainly deals with ________. [A] the differences of children in their learning capabilities [B] the definition of exceptional children in modern society [C] the special educational programs for exceptional children [D] the necessity of adapting education to exceptional children 62. From this passage we learn that the educational concern for exceptional children ________. [A] is now enjoying legal support [B] disagrees with the tradition of the country [C] was clearly stated by the country's founders [D] will exert great influence over court decisions Passage 4 "I have great confidence that by the end of the decade we'll know in vast detail how cancer cells arise," says microbiologist Robert Weinberg, an expert on cancer. "But," he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur, he discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available." This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years. In the year 2000, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistics are still discouraging — 13 percent for lung cancer, and 2 percent for cancer of the pancreas. With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes, are inactive in normal cells. Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous. The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers. "Changes are a normal part of the evolutionary process," says oncologist William Hayward, Environmental factors can never be totally eliminated; as Hayward points out, "We can't prepare a medicine against cosmic rays." The prospects for cure, though still distant, are brighter. "First, we need to understand how the normal cell controls itself, Second, we have to determine whether there are a limited number of genes in cells which are al-ways responsible for at least part of the trouble. If we can understand how cancer works, we can counteract its action." 63. The example of Pasteur in the passage is used to ________. [A] predict that the secret of cancer will be disclosed in a decade [B] indicate that the prospects for curing cancer are bright [C] prove that cancer will be cured in fifty to sixty years [D] warn that there is still a long way to go before cancer can be conquered 64. The author implies that by the year 2000, ________