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题目是天山7-13，改为问weaken
Q13:
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 whitefooted
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.
B. There are no known cases of a human’s contracting Lyme disease through contact
with white-footed mice.
C. A deer tick feeds only once while in the larval stage.
D. A single host animal can be the source of bacteria for many tick larvae.
E. None of the other species on which deer tick larvae feed harbor other bacteria that
ticks transmit to humans.
如果是strengthens ，选c无疑，但改为weaken后，写jj的nn说：此提变体问weaken,这样一来答案就很清楚了.我的是deer ticks will not pick up the infection after become adult.
于是偶就想不通了，tick长大后会不会感染上病毒与他小时候会不会吃了脏东西感染上没什么关系呀，...非常纳闷，明天就考了，恳请大家指点一下  | 
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发表于 2005-9-22 09:01:00
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