[CR. ] PP3 No.99

看板GMAT (GMAT入學考試)作者WashMachine (轉阿轉的洗衣機)時間15年前 (2010/08/17 21:44)推噓1(1推 0噓 2→)

留言3則, 3人參與討論串1/1

100. (30745-!-item-!-188;#058&005748) 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 by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline. Which of the following would it be most important to ascertain in evaluating the argument? A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans 答案是B 可是我不知道為什麼@@ 可以請大家幫忙解釋一下嘛謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.112.219.180