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The canopy, the upper level of the trees in the rain forest, holds a plethora of climbing mammals of moderately large size, whic
The canopy, the upper level of the trees in the rain forest, holds a plethora of climbing mammals of moderately large size, whic
admin
2022-12-06
50
问题
The canopy, the upper level of the trees in the rain forest, holds a plethora of climbing mammals of moderately large size, which may include monkeys, cats, civets, and porcupines. Smaller species, including such rodents as mice and small squirrels, are not as prevalent overall in high tropical canopies as they are in most habitats globally.
Small mammals, being warm-blooded, suffer hardship in the exposed and turbulent environment of the uppermost trees. Because a small body has more surface area per unit of weight than a large one of similar shape, it gains or loses heat more swiftly. Thus, in the trees, where shelter from heat and cold may be scarce and conditions may fluctuate, a small mammal may have trouble maintaining its body temperature.
Small size makes it easy to scramble among twigs and branches in the canopy for insects, flowers, or fruit, but small mammals are surpassed, in the competition for food, by large ones that have their own tactics for browsing among food-rich twigs. The weight of a gibbon (a small ape) hanging below a branch arches the terminal leaves down so that fruit-bearing foliage drops toward the gibbon’s face. Walking or leaping species of a similar or even larger size access the outer twigs either by snapping off and retrieving the whole branch or by clutching stiff branches with the feet or tail and plucking food with their hands.
Small climbing animals may reach twigs readily, but it is harder for them than for large climbing animals to cross the wide gaps from on tree crown to the next that typify the high canopy. A macaque or gibbon can hurl itself farther than a mouse can: it can achieve a running start, and it can more effectively use a branch as a springboard, even bouncing on a climb several times before jumping. The forward movement of a small animal is seriously reduced by the air friction against
the relatively large surface area of its body. Finally, for the many small mammals that supplement their insect diet with fruits or seeds, an inability to span open gaps between tree crowns may be problematic, since trees that yield these foods can be
sparse
.
We can infer from the passage that many small mammals mainly feed on?
选项
A、Insects.
B、Flowers.
C、Fruits.
D、Seeds.
答案
A
解析
细节题。根据第四段中的“Finally, for the many small mammals that supplement their insect diet with fruits or seeds…”可知,很多小型动物的主食是昆虫。故本题选A。
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本试题收录于:
英语学科知识与教学能力题库教师资格分类
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