英语专业四级阅读理解基础训练.doc

英语专业四级阅读理解基础训练.doc英语专业四级阅读理解基础训练

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　　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-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 voraciou