请教题目两道，谢谢！

duweiduwei

1
Guidebook writer:I have visited hotels throughout the country and hae noticed that in those built before 1930 the quality of the original carpentry work is generally sperior to that in hotels built afterward. Clearly carpenters working on hotels before 1930 typically worked with more skill, care, and effort than carpenters who have worked on hotels built subsequently.
which of the following, if true most seriously weakens the guidebook writer's argument?

Answer:
The better the quality of original carpentry in a building, the less likely that building is to fall into disuse and be demolished.
原文意思是1930年以前的木匠活比之后的好，这是1930年前的木匠手艺高超，比较用心导致的。
但此选项意思是木匠活做的越好，建筑就越不容易被废除。我没有想明白为什么削弱了上述文字？

2

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
B选项谈的是tick的数量与食物多少的关系，而文章强调tick吃的食物里是否有感染的细菌从而影响后来是否有细菌的tick的数量。为什么选B呢？

谢谢！

duweiduwei

francoisyang 发表于 2013-7-1 14:04
1. 1930之前质量不好的可能已经报废了，所以没被看到；
2. 原文说因为其他物种数量增多，更多幼虫可以feed  ...

哦，明白了，谢谢~

francoisyang

1. 1930之前质量不好的可能已经报废了，所以没被看到；
2. 原文说因为其他物种数量增多，更多幼虫可以feed on未感染的主体，所以感染细菌的虫数量下降。B选项强调现在tick的数量是否受可以feed on的主体的限制，如果不受限制，那其他主体数量增多，tick也未必去寄生，可能还是选择白脚鼠。
顺便说一下这里feed on感觉不是吃，而是寄生。