专四

单选题 What can we learn from the passage?

A．Tracers believe long-term effective practice Call help avoid injuries．
B．Beginners should train their endurance above all．
C．All parkour participators pay less attention to their safety．
D．Large drops are the most difficult techniques of parkour．

参考答案：A进入在线模考
A。本题需要根据选项一一定位排除。根据A项的avoid定位到原文末段最后一句，该句提到练习跑酷的人强调循序渐进的练习以避免出现问题，也就是他们相信长期有效的练习可以避免伤害，A项是对原文的同义转述，故选A。根据B项中的Beginners定位到末段第一句，该句强调初学者应该多学一些基本技能，以锻炼其技能的多样性和有效性，由此可知，对于初学者忍耐力并不是第一位的，故排除B。C项 “所有的跑酷者都不怎么关心自己的安全”，太过绝对，可排除；文中并未提到large drops是否是跑酷最难的技术，只是说large drops有一定的危险性，故排除D。

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1 Which ofthe following activities is mostly close to parkour?

A．Martial art．
B．Obstacle race．
C．Gymnastics．
D．Acrobatics．

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2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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3 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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