一道阅读的削弱题

paopao

Cub-carrying also occurs

among some other myrmecophagous

(10) (ant-eating) mammals; therefore, one

explanation is that cub-carrying is

necessitated by myrmecophagy, since

myrmecophagy entails a low metabolic

rate and high energy expenditure in

(15) walking between food patches. （解释一：减少能耗）How-

ever, although polar bears’ locomotion

is similarly inefficient, polar bear cubs

walk along with their mother. Further-

more, the daily movements of sloth

(20) bears and American black bears—

which are similar in size to sloth bears

and have similar-sized home ranges—

reveal similar travel rates and distances,

suggesting that if black bear cubs are

(25) able to keep up with their mother, so

too should sloth bear cubs.（反驳：解释一。几种熊运动都差/大小相似/家的距离相似）

Q11: Which of the following, if true, would most weaken the author’ s argument in lines 18-26

(“ Furthermore … sloth bear cubs”)?逻辑题，削弱题：几种熊运动都差/大小相似/家的距离相似==》背孩子不是因为能量消耗的原因

A. Cub-carrying behavior has been observed in many non-myrmecophagous

mammals.无

B. Many of the largest myrmecophagous mammals do not typically exhibit cub-carrying

behavior.无

C. Some sloth bears have home ranges that are smaller in size than the average home

ranges of black bears.

D. The locomotion of black bears is significantly more efficient than the locomotion

of sloth bears.

E. The habitat of black bears consists of terrain that is significantly more varied than

that of the habitat of sloth bears.无关比较点

答案是D 我选了C

C为何不对呢

是不是因为some  所以跟原文并没有矛盾

可是削弱并不需要充分性 即使有一点削弱也行啊

请教大家 谢谢

leeon

C并不能削弱，原文已经说了（American black bears） are similar in size to （sloth bears ）and have similar-sized home ranges— reveal similar travel rates and distances,

原文已经说的很清楚黑熊和惰熊home ranges是相似大小的。C比较some和average，这个比较结果不能影响原文的结论。

D说黑熊比惰熊运动能力更有效力，原文结论说if black bear cubs are able to keep up with their mother, so too should sloth bear cubs.这样惰熊就不一定能跟上了，也就削弱了原文的结论。

paopao

leeon 谢谢你的答复

也就是说

因为some  所以跟原文average 并没有矛盾

对吗

[此贴子已经被作者于2004-8-31 10:07:38编辑过]

leeon

对的，这里比较some 和average是没有意义的。