T-9-Q28.天山-7-13 排除法+inference
Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.
Which of the following, if true, most strengthens the argument?
A.Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.（取反不削弱）
B.There are no known cases of a human’s contracting Lyme disease through contact with white-footed mice.（无关）
C.A deer tick feeds only once while in the larval stage.如果deer ticks在幼虫时期只进食一次，则只要它们吃的是其他那些不带病菌的物种而少吃带菌白腿鼠，则染菌的deer ticks就会减少，从而传染给人的几率也会变少）
D.A single host animal can be the source of bacterium for many tick larvae.（无关）
E.None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans（与传染该种疾病的细菌无关）
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发表于 2009-7-28 20:47:00
