【正文】 of dramatic accidents. Sir Alexander Fleming did not, as legend would have it, look at the mold on a piece of cheese and get the idea for penicillin there and then. He experimented with 該套資料由蕓蕓視頻整理 ： 747883097 TL： 028 8194 2202 期待廣大考生咨詢 推薦： 09 年新東方考研數(shù)學英語政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤 7 antibacterial substances for nine years before he made his discovery. Inventions and innovations almost always e out of laborious trial and error. Innovation is like soccer。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 2020, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the fiveyear 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 cancercausing 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 該套資料由蕓蕓視頻整理 ： 747883097 TL： 028 8194 2202 期待廣大考生咨詢 推薦： 09 年新東方考研數(shù)學英語政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤 6 cell, unable to turn them off, bees 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。s understanding — the knowledge, hopes, and fears that are passed on to the next generation. Education in any society is a mirror of that society. In that mirror we can see the strengths, the weaknesses, the hopes, the prejudices, and the central values of the culture itself. The great interest in exceptional children shown in public education over the past three decades indicates the strong feeling in our society that all citizens, whatever their special conditions, deserve the opportunity to fully develop their capabilities. All men are created equal. We39。該套資料由蕓蕓視頻整理 ： 747883097 TL： 028 8194 2202 期待廣大考生咨詢 推薦： 09 年新東方考研數(shù)學英語政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤 0 考研英語閱讀理解電子教材 主講： 范猛 歡迎使用新東方在線電子教材 教材說明： 本電子教材 word 文檔下面的頁碼跟教材完全一樣，學員只需根據(jù)老師說的多少頁找到相應的頁面學習即可。s already here. While puters offer these conveniences to consumers. they have many advantages for sellers too. Electronic cash registers can do much more than simply ring up sales. They can keep a wide range of records, including who sold what, when, and to whom. This information allows businessmen to keep track of their list of goods by showing which items are being sold and how fast they are moving. 該套資料由蕓蕓視頻整理 ： 747883097 TL： 028 8194 2202 期待廣大考生咨詢 推薦： 09 年新東方考研數(shù)學英語政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤 3 Decisions to reorder or return goods to suppliers can then be made. At the same time these puters record which hours are busiest and which employees are the most efficient, allowing personnel and staffing assignments to be made accordingly. And they also identify preferred customers for promotional campaigns. Computers are relied on by manufacturers for similar reasons. Computeranalyzed marketing reports can help to decide which products to emphasize now, which to develop for the future, and which to drop. Computers keep track of goods in stock, of raw materials on hand, and even of the production process itself. Numerous other merical enterprises, from theaters to magazine publishers, from gas and electric utilities to milk processors, bring better and more efficient services to consumers through the use of puters. 55. According to the passage, the credit card enables its owner to ________. [A] withdraw as much money from the bank as he wishes [B] obtain more convenient services than other people do [C] enjoy greater trust from the storekeeper [D] cash money wherever he wishes to 56. From the last sentence of the first paragraph we learn that ________. [A] in the future all the Americans will use credit cards [B] credit cards are mainly used in the United States today [C] nowadays many Americans do not pay in cash [D] it is now more convenient to use credit cards than before 57. The phrase ring up sales (Line 2, Para. 2) most probably means ________ [A] make an order of goods [B] record sales on a cash register [C] call the sales manager [D] keep track of the goods in stock 58. What is this passage mainly about? [A] Approaches to the mercial use of puters. [B] conveniences brought about by puters in business. [C] Significance of automation in mercial enterprises. [D] Advantages of credit cards in business. Passage 3 該套資料由蕓蕓視頻整理 ： 747883097 TL： 028 8194 2202 期待廣大考生咨詢 推薦： 09 年新東方考研數(shù)學英語政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤 4 Exceptional children are different in some significant way from others of the same age. For these children to develop to their full adult potential. their education must be adapted to those differences. Although we focus on the needs of exceptional children, we find ourselves describing their environment as well. While the leading actor on the stage captures our attention, we are aw