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117. A certain viral infection is widespread among children, and about 30 percent of children infected with the virus develop middle ear infections. Antibiotics, although effective in treating bacterial infections, have no effect on the virus. Yet when middle ear infections in children infected with the virus are treated with antibiotics, the ear often clear up.
Which one of the following most helps to explain the success of the treatments with antibiotics?
A. Although some types of antibiotics fail to clear up certain infections, other types of antibiotics might provide effective treatment for those infections.
B. Children infected with the virus are particularly susceptible to bacterial that infect the middle age.
C. Many children who develop middle ear infections are not infected with the virus.
D. Most viral infections are more difficult to treat than are most bacterial infections.
E. Among children not infected with the virus, fewer than 30 percent develop middle ear infections.
答案为B，求讲解。
120. In Europe, schoolchildren devote time during each school day to calisthenics. North American schools rarely offer a daily calisthenics program. Tests prove that North America children are weaker, slower, and shorter-winded than European children. We must conclude that North American children can be made physically fit only if they participate in school calisthenics on a daily basis.
Which one of the following is assumed in the passage?
A.All children can be made physically fit by daily calisthenics.
B.All children can be made equally physically fit by daily calisthenics.
C.Superior physical fitness produces superior health.
D.School calisthenics are an in indispensable factor in European children’s
E.North American children can learn to eat a more nutritious diet as well as to exercise daily.
答案D,同求讲解。
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发表于 2010-5-19 03:34:03
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