[高考前父母怎样与孩子沟通]1、用写博客的方式来进行沟通。这种沟通是比较文明和比较容易让小孩接受的方式。从口头交流变成了网上阅读，而且又不受时间和空间的限制，所以是比较理想而又高雅的沟通方式。...+阅读
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Certainly no creature in the sea is odder than the mon sea cucumber. All living creature, especially human beings, he 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. mon 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 e in a variety of colors, ranging from black to reddishbrown to sandcolor and nearly white. One form even has vivid purple tentacles. Usually the creatures are cucumbershaped—hence their name—and because they are typically rock inhabitants, this shape, bined with flexibility, enables them to squeeze into crevices where they are safe from predators and ocean currents.
Although they he voracious appetites, eating day and night, sea cucumbers he the capacity to bee quiescent and live at a low metabolic rate—feeding sparingly or not at all for long periods, so that the marine anisms that provid their food he a chance to multiply. If it
were not for this faculty, they would devour all the food ailable 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 ans 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 bees too polluted.
20. 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.
21. The fourth paragraph of the passage primarily discusses ____.
A. the reproduction of sea cucumbers
B. the food sources of sea cucumbers
C. the eating habits of sea cucumbers
D. threats to sea cucumbers‘ existence
22. What can be inferred about the defence mechanisms of the sea cucumber?
A. They are very sensitive to surrounding stimuli.
B. They are almost useless.
C. They require group cooperation.
D. They are similar to those of most sea creatures.
23. Which of the following would NOT cause a sea cucumber to release its internal ans into the water?
A. A touch. B. Food.
C. Unusually warm water. D. Pollution.
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