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AIDS threatens not only lives butalso—in poor countries—economic development. By (1) mainly at adults 20 to 49 years old, AIDS robs these societies (2) some of their most productive citizens. Ignorance and fear of the disease can (3) families and communities and may even strain political relations between nations. Because AIDS is a worldwide epidemic (传染病，流行病), nothing (4) than a worldwide effort can control and perhaps some day wipe the disease. Governments must (5) by fully informing their citizens (6) the epidemic and, most important, by telling people (7) actions they can take to prevent infection (感染 ). Public health agencies must also insure that blood transfusions(输血) and (8) are safe. Those already infected should receive (9) attention so they do not spread the virus to (10) . The US government has committed more than two billion dollars to fight (11) AIDS in 1989—including more than 600 million dollars for research. The screening of blood (12) has already ensured the safety of blood supplies in the US, and American military personnel are required to take (13) blood tests. Public health groups have carried (14) AIDS educatior programs aimed particularly at homo- sexuals, (15) addicts and others whose behavior makes them highly susceptible (易受影响的) (16) the virus US government agencies are also (17) public health authorities throughout the developing world in their efforts to (18) the spread of the AIDS virus and to treat those afflicted with the disease. Given the rapid spread of the disease and the number of people now (19) , the battle against AIDS will be difficult to win. But it’s a battle the world cannot (20) to lose.
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American teenagers have always worked for extra pocket money. More than their predecessors (前辈), today’s young people are (1) to work long hours during the week for hundreds of dollars each months. They spend the money (2) themselves rather than contributing it (3) their families. In a 1997 (4) of 16,000 high school seniors nationwide, it was (5) that eighty percent of students who worked (6) their earnings on their own needs, (7) as clothing, stereo equipment, records and movies. (8) five percent said they contributed most of their income, (9) often exceeded 200 a month, to help pay family living (10) . The benefits of this work-and- spend ethics (伦理观) are being (11) argued. Some experts, and many parents, (12) that year-round part-time employment increases youngsters’ (13) of worth, teaches them (14) responsibility and reduces tension, and thus conflict(冲突) (15) the family. Others, (16) , argue that working teenagers are separated, physically and financially, (17) their families, which in tum (18) parental authority. Teenagers’ schoolwork can also suffer."When youngsters (19) for luxuries, they are buying distraction (20) education," said a program director for the U.S. Department of Education. Working teenagers them- selves say they have less time to spend with their friends and families.
AIDS threatens not only lives butalso—in poor countries—economic development. By (1) mainly at adults 20 to 49 years old, AIDS robs these societies (2) some of their most productive citizens. Ignorance and fear of the disease can (3) families and communities and may even strain political relations between nations. Because AIDS is a worldwide epidemic (传染病，流行病), nothing (4) than a worldwide effort can control and perhaps some day wipe the disease. Governments must (5) by fully informing their citizens (6) the epidemic and, most important, by telling people (7) actions they can take to prevent infection (感染 ). Public health agencies must also insure that blood transfusions(输血) and (8) are safe. Those already infected should receive (9) attention so they do not spread the virus to (10) . The US government has committed more than two billion dollars to fight (11) AIDS in 1989—including more than 600 million dollars for research. The screening of blood (12) has already ensured the safety of blood supplies in the US, and American military personnel are required to take (13) blood tests. Public health groups have carried (14) AIDS educatior programs aimed particularly at homo- sexuals, (15) addicts and others whose behavior makes them highly susceptible (易受影响的) (16) the virus US government agencies are also (17) public health authorities throughout the developing world in their efforts to (18) the spread of the AIDS virus and to treat those afflicted with the disease. Given the rapid spread of the disease and the number of people now (19) , the battle against AIDS will be difficult to win. But it’s a battle the world cannot (20) to lose.
Marvin Minsky is famous (1) the father of Artificial Intelligence, but he was (2) the author of another signal achievement. In the 1950s, he built a revolutionary light microscope that enabled him to (3) successfully deeper layer in a specimen with astonishing clearness, (4) first having to undertake the hard task of cutting the specimen into thin (5) Minsky’s invention did not (6) wide praise from the public at that time. (7) , when he patented(申请 专利权) his "double - focusing stage-scanning microscope" in 1961, (8) people understood what it could do. During the 17-year life of the patent, no (9) of similar design were manufactured. (10) for his newly invented optics, Minsky (11) on to other challen- ges, leaving his intention to rust in a (12) of his basement. Thirteen years later his approach (13) known as confocal microscopy(双焦显微镜学) caught public attention. (14) , the technology is proving to be one of the most exciting advances in optical microscopy in this century. The extent (15) which current interest was sparked by rediscovery of Minsky’s early (16) is not completely clear. (17) , the happy result is that scores of (18) kinds of confocal microscopes are now (19) in form that (20) from easy to complicated.
AIDS threatens not only lives butalso—in poor countries—economic development. By (1) mainly at adults 20 to 49 years old, AIDS robs these societies (2) some of their most productive citizens. Ignorance and fear of the disease can (3) families and communities and may even strain political relations between nations. Because AIDS is a worldwide epidemic (传染病，流行病), nothing (4) than a worldwide effort can control and perhaps some day wipe the disease. Governments must (5) by fully informing their citizens (6) the epidemic and, most important, by telling people (7) actions they can take to prevent infection (感染 ). Public health agencies must also insure that blood transfusions(输血) and (8) are safe. Those already infected should receive (9) attention so they do not spread the virus to (10) . The US government has committed more than two billion dollars to fight (11) AIDS in 1989—including more than 600 million dollars for research. The screening of blood (12) has already ensured the safety of blood supplies in the US, and American military personnel are required to take (13) blood tests. Public health groups have carried (14) AIDS educatior programs aimed particularly at homo- sexuals, (15) addicts and others whose behavior makes them highly susceptible (易受影响的) (16) the virus US government agencies are also (17) public health authorities throughout the developing world in their efforts to (18) the spread of the AIDS virus and to treat those afflicted with the disease. Given the rapid spread of the disease and the number of people now (19) , the battle against AIDS will be difficult to win. But it’s a battle the world cannot (20) to lose.
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