Reading Comprehension

试题详情

文章:

    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 keep up with their mother, so too should sloth bear cubs.

    An alternative explanation is defense from predation. Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs. Like brown bears and polar bears (and unlike other myrmecophagous mammals, which are 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. 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 persist today on the Indian subcontinent, this type of habitat was once widespread there. Grasslands support high densities of tigers, which fight and sometimes kill sloth bears; sloth bears 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 selected against tree-climbing as a defensive strategy for sloth bear cubs. Because sloth bears are smaller than brown and polar bears and are under greater threat from dangerous animals, they may have adopted the extra precaution of carrying their cubs. Although cub-carrying may also be adoptive for myrmecophagous foraging, the behavior of sloth bear cubs, which climb on their mother's back at the first sign of danger, suggests that predation was a key stimulus.

题目:

Which of the following is mentioned in the passage as a way in which brown bears and sloth bears are similar?

选项:

A、They tend to become aggressive when provoked.
B、They live almost exclusively in treeless environments.
C、They are preyed upon by animals that can climb or topple trees.
D、They are inefficient in their locomotion.
E、They have relatively large canine teeth.

答案:

A

提问:

rc 无录音(罗列了很多却都没有录音)
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提问:

在AB中纠结,因为有两处like都说了相似点,听了几个讲解都是一下定位到第一个like没管第二个相似点,想问为什么这么排除
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提问:

50.一个油漆工要粉刷墙壁, 有六种颜色的颜料:red yellow blue white black purple ;要求选择一个或者一个以上的颜料进行粉刷。问如果selection包含白 色,那么一共有多少种可能性。 是否要考虑顺序呢 2.一个油漆工要粉刷墙壁, 有六种颜色的颜料:red yellow blue white black purple ;要求选择一个或者一个以上的颜料进行粉刷。问如果selection包含白 色,那么一共有多少种可能性。 变体:有两个事件,A的发生概率是0.8,B的发生概率是0.6。 求他们同时发生的概率 (1)A B 是独立事件 (2)neither A or B 会发生的概率是0.08 3.另一提比较烦的DS题:有个人存了1000块进去,复利。年利率X。 问存了一年之后,这个人的钱是否会>1050 (1) (1+x/200)^2 >= 1.05 (2) (1+x/400)^2 > 1.025( 此处的年里利率X,是X%还是X?
评分: 0
浏览: 93

提问:

rc 无录音(罗列了很多却都没有录音)
评分: 0
浏览: 117

提问:

在AB中纠结,因为有两处like都说了相似点,听了几个讲解都是一下定位到第一个like没管第二个相似点,想问为什么这么排除
评分: 0
浏览: 105

提问:

50.一个油漆工要粉刷墙壁, 有六种颜色的颜料:red yellow blue white black purple ;要求选择一个或者一个以上的颜料进行粉刷。问如果selection包含白 色,那么一共有多少种可能性。 是否要考虑顺序呢 2.一个油漆工要粉刷墙壁, 有六种颜色的颜料:red yellow blue white black purple ;要求选择一个或者一个以上的颜料进行粉刷。问如果selection包含白 色,那么一共有多少种可能性。 变体:有两个事件,A的发生概率是0.8,B的发生概率是0.6。 求他们同时发生的概率 (1)A B 是独立事件 (2)neither A or B 会发生的概率是0.08 3.另一提比较烦的DS题:有个人存了1000块进去,复利。年利率X。 问存了一年之后,这个人的钱是否会>1050 (1) (1+x/200)^2 >= 1.05 (2) (1+x/400)^2 > 1.025( 此处的年里利率X,是X%还是X?
评分: 0
浏览: 93
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