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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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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.
The horse and carriage is a thing of the past, but love and marriage are still with us and still closely interrelated. Most American marriages, (1) first marriages uniting young people, are the result of mutual attraction and affection (2) than practical considerations. In the United States, parents do not (3) marriages for their children. Teenagers begin dating in high school and usually find mates through their own academic and social (4) . (5) young people feel free to choose their friends from (6) groups, most choose a mate of similar (7) . This is due in part to parental guidance. Parents cannot (8) spouses (配 偶 ) for their children, but they can usually (9) choices by voicing disapproval of someone they consider unsuitable. (10) , marriages between members of different groups (interclass, interfaith, and interracial marriages) are (11) probably because of the greater mobility of today’s youth and the fact that they are (12) by fewer prejudices than their parents. Many young people leave their hometowns to attend college, serve in the armed forces, (13) pursue a career in a bigger city. Once away from home and family, they are more (14) to date and marry outside their own social group. In mobile American society, inter- class marriages are neither (15) nor astoni- shing. Interfaith marriages are (16) the rise, especially between Protestants (基督 教徒) and Catholics (天主教徒). On the other hand, interracial marriages are still very (17) . It can be difficult for interracial couples to find a place to live, maintain friendships, and (18) a family. Marriages between people of different national (19) (but the same race and religion) have been commonplace here (20) colonial times.
The horse and carriage is a thing of the past, but love and marriage are still with us and still closely interrelated. Most American marriages, (1) first marriages uniting young people, are the result of mutual attraction and affection (2) than practical considerations. In the United States, parents do not (3) marriages for their children. Teenagers begin dating in high school and usually find mates through their own academic and social (4) . (5) young people feel free to choose their friends from (6) groups, most choose a mate of similar (7) . This is due in part to parental guidance. Parents cannot (8) spouses (配 偶 ) for their children, but they can usually (9) choices by voicing disapproval of someone they consider unsuitable. (10) , marriages between members of different groups (interclass, interfaith, and interracial marriages) are (11) probably because of the greater mobility of today’s youth and the fact that they are (12) by fewer prejudices than their parents. Many young people leave their hometowns to attend college, serve in the armed forces, (13) pursue a career in a bigger city. Once away from home and family, they are more (14) to date and marry outside their own social group. In mobile American society, inter- class marriages are neither (15) nor astoni- shing. Interfaith marriages are (16) the rise, especially between Protestants (基督 教徒) and Catholics (天主教徒). On the other hand, interracial marriages are still very (17) . It can be difficult for interracial couples to find a place to live, maintain friendships, and (18) a family. Marriages between people of different national (19) (but the same race and religion) have been commonplace here (20) colonial times.
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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