GWD6-11 已经搜过没有讨论过

FIGHTING618

The sloth bear, an insect-eating animal native to Nepal, exhibits only one behavior that is truly distinct from that of other bear species:the females carry their cubs (at least part-time) until the cubs are about nine months old, even though the cubs can walk on their own at six months.Cub-carrying also occurs among some other myrmecophagous (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 walking between food patches.However, although polar bears’ locomotion is similarly inefficient, polar bear cubs walk along with their mother.Furthermore, the daily movements of sloth 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 able to (26) keep up with their mother, so too should sloth bear cubs.

Which of the following, if true, would most weaken the author’s argument in lines 18-26 (“Furthermore … sloth bear cubs”)?

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

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

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.



E为什么不对，D怎么出来的？求指教。与上面提到的POLAR BEAR的LOCOMOTION有关吗？


Which of the following, if true, would most weaken the author’s argument in lines 18-26 (“Furthermore … sloth bear cubs”)?

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

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

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.



E为什么不对，D怎么出来的？求指教。与上面提到的POLAR BEAR的LOCOMOTION有关吗？

mudiduange

前提：S熊和B熊大小和家庭范围都很相似
         B熊够赶得上它的妈妈
结论：S熊也能赶上妈妈

问题问驳斥，看答案，的确只有DE相关，比较这两个选项：
D：B熊比S熊移动更有效
E：原文说的是home ranges, 本题说的是habitat,不一样。呵呵，这里偷梁换柱了，也就说这个也可以看做无关选项。

FIGHTING618

可是，habitat不同的话不是会影响移动效率吗。
例如高山跟平原，显然在平原要走得容易些啊。

这道题，我想是不是因为说提到那个TRAVEL RATE??

caoqin1981

我也错选了E，还没想通，也许放在逻辑里面做是个不相关选项，因为文章没有提到habitat，期待NN解释吧，