[单项选择]

Disability among the elderly has declined markedly in the United States in the past two decades. In 1984, 25 percent of the elderly population reported difficulty with activities associated with independent living. By 1999, the share had fallen to 20 percent, a decline of one-fifth. Although these basic facts are well known, their interpretation is not clear. Is the reduction in disability a result of improved medical care, individual behavioral changes, environmental modifications that allow the elderly to better function by themselves, or other demographic changes Will the trend continue, or is it time limited What does the reduction in disability mean for years of healthy life and labor force participation
The researchers David Cutler, Mary Beth Landrum, and Kate Stewart focus on disability caused by cardiovascular disease to investigate the role of improved medical care on reductions in disability. By looking at just one condition, they can analyze health shocks and t
A. citing a group of data
B. justifying an assumption
C. making a comparison
D. explaining a phenomenon

[单项选择]Disability among the elderly has declined markedly in the United States in the past two decades. In 1984, 25 percent of the elderly population reported difficulty with activities associated with independent living. By 1999, the share had fallen to 20 percent, a decline of one-fifth. Although these basic facts are well known, their interpretation is not clear. Is the reduction in disability a result of improved medical care, individual behavioral changes, environmental modifications that allow the elderly to better function by themselves, or other demographic changes Will the trend continue, or is it time limited What does the reduction in disability mean for years of healthy life and labor force participation
The researchers David Cutler, Mary Beth Landrum, and Kate Stewart focus on disability caused by cardiovascular disease to investigate the role of improved medical care on reductions in disability. By looking at just one condition, they can analyze health shocks and their outc
A. citing a group of data
B. justifying an assumption
C. making a comparison
D. explaining a phenomenon

[单项选择]Alec Guinness has few equals among Englishspeaking actors, and in his autobiography he reveals himself to be an uncommonly ______ prose stylist as well.
A. ambivalent
B. infamous
C. supercilious
D. felicitous
E. pedestrian

[单项选择]The telephone has intensified conflicts among people because（）
A. it increases the danger of war
B. it provides services to both the good and the malicious
C. it makes distant communication easier
D. it breaks up the multi-generational household

[填空题]Confucianism has its greatest effect among European countries in

[单项选择]

Among the devastating consequences of AIDS has (21) its epidemic spread in the developing world. The disease has caused (22) suffering, debilitation, loss of life and disruption of family, social and economic (23) Because of the considerable expense and logistical difficulty in providing antiviral drugs to populations (24) with the Human Immunodeficiency Virus (25) the world, the biomedical community is looking towards vaccines to help solve this compelling problem. The search for an AIDS vaccine began more than 15 years ago with great (26) and high expectations. With the (27) of the Human Immunodeficiency Virus (HIV) as the cause of AIDS, it seemed that a (28) would follow closely behind. But despite a large concerted effort, the problem has proven more difficult than (29) , and progress has not (30) the (31) hopes. Here I review the (32) scientific obstacles confronting the development of an effective HIV vaccine, and I consider (33) strategies to overcome these obstacles. It i
A. surpassed
B. out-balanced
C. matched
D. rivaled