Which ofthe following activities is mostly close to parkour?

A．Martial art．

B．Obstacle race．

C．Gymnastics．

D．Acrobatics．

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答案解析

B。本题的出题点在人物观点处(According to…)。根据文章第一段第三句，该句提到跑酷的物质方面就是在紧急情况下尽力越过面前的所有障碍，结合选项可以推断跑酷最接近于障碍赛，故选B。

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1 根据以下资料，回答题：
        Certainly no creature in the sea is odder than the common sea cucumber．All living creature，especially human beings, have their peculiarities，but everything about the little sea cucumber seems unusual．What else can be said about a bizarre animal that，among other eccentricities，eats mud，feeds almost continuously day and night but can live without eating for long periods，and can be poisonous but is considered supremely edible by gourmets?
        For some fifty million years，despite all its eccentricities，the sea cucumber has subsisted on its diet of mud．It is adaptable enough to live attached to rocks by its tube feet，under rocks in shallow water，or on the surface of mud flats．Common in cool water on both Atlantic and Pacific shores，it has the ability to suck up mud or sand and digest whatever nutrients are present．
Sea cucumbers come in a variety of colors，ranging from black to reddish brown to sand color and nearly white．One form even has vivid purple tentacles．Usually the creatures are cucumber shaped—-hence their name-一and because they are typically rock inhabitants，this shape，combined with flexibility，enables them to squeeze into crevices where they are safe from predators and ocean currents．
        Although they have voracious appetites，eating day and night，sea cucumbers have the capacity to become quiescent and live at a low metabolic rate--feeding sparingly or not at all for long periods，so that the marine organisms that provide their food have a chance to multiply．If it were not for this faculty．they would devour all the food available in a short time and would probably starve themselves out of existence．
        But the most spectacular thing about the sea cucumber is the way it defends itself．Its major enemies are fish and crabs，when attacked，it squirts all its internal organs into water．It also casts off attached structures such as tentacles．The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched；it will do the same if the surrounding water temperature is too high or if the water becomes too polluted．

According to the passage，why is the shape of sea cucumbers important?

A．It helps them to digest their food．

B．It helps them to protect themselves from danger．

C．It makes it easier for them to move through the mud．

D．It makes them attractive to fish．

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2 The words“ this faculty”(Line 3，Para．4)refers to the sea cucumbers ability to__________．

A．squeeze into crevices

B．devour all available food in a short time

C．suck up mud or sand

D．1ive at a low metabolic rate

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3 The 4th paragraph of the passage primarily discusses__________．

A．the reproduction of sea cucumbers

B．the food sources of sea cucumbers

C．the eating h曲its of sea cucumbers

D．threats to sea cucumbers’ existence

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