GMAT考试资料：GWD试题合集（十三）.

　　以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　1. GWD-6-Q9 to Q12小树懒为什么要往他妈背上爬

　　The sloth bear, an insect-eating

　　animal native to Nepal, exhibits only one

　　behavior that is truly distinct from that of

　　Line other bear species: the females carry

　　(5) 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

　　(10) (ant-eating) mammals; therore, 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. How-

　　ever, although polar bears’ locomotion

　　is similarly inficient, 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.长毛熊cub-carrying的一种解释及缺陷

　　An alternative explanation is dense

　　from predation. Black bear cubs use

　　trees for dense, whereas brown bears

　　(30) and polar bears, which regularly inhabit

　　treeless environments, rely on aggres-

　　sion to protect their cubs. Like brown

　　bears and polar bears (and unlike other

　　myrmecophagous mammals, which are

　　(35) noted for their passivity), sloth bears

　　are easily provoked to aggression.

　　Sloth bears also have relatively large

　　canine teeth, which appear to be more

　　functional for fighting than for foraging.

　　(40) Like brown bears and polar bears,

　　sloth bears may have evolved in an

　　environment with few trees. They are

　　especially attracted to food-rich

　　grasslands; although few grasslands

　　(45) persist today on the Indian subcontinent,

　　this type of habitat was once wide-

　　spread there. Grasslands support

　　high densities of tigers, which fight and

　　sometimes kill sloth bears; sloth bears

　　(50) also coexist with and have been killed

　　by tree-climbing leopards, and are often

　　confronted and chased by rhinoceroses

　　and elephants, which can topple trees.

　　Collectively these factors probably

　　(55) selected against tree-climbing as a

　　densive strategy for sloth bear cubs.

　　Because sloth bears are smaller than

　　brown and polar bears and are under

　　greater threat from dangerous animals,

　　(60) they may have adopted the extra pre-

　　caution of carrying their cubs. Although

　　cub-carrying may also be adoptive for

　　myrmecophagous foraging, the behavior

　　of sloth bear cubs, which climb on their

　　(65) mother’s back at the first sign of danger,

　　suggests that predation was a key

　　stimulus.另外一种解释

　　现象解释

　　逻辑简图：

　　1P: sloth bear exhibits only one behavior that truly distinct from other: cub-carrying….

　　Cub also occur, therore, one explanation is by m. however. Furthermore…

　　2P: an alternative explanation is dense from predation. Predation was a key stimulus.

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（十二）

2.GMAT考试资料：GWD试题合集（十一）

3.GMAT考试资料：GWD试题合集（十）

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