首页
登录
职称英语
Certainly no creature in the sea is odder than the common sea cucumber. All
Certainly no creature in the sea is odder than the common sea cucumber. All
游客
2024-10-29
26
管理
问题
Certainly no creature in the sea is odder than the common sea cucumber. All living creatures, 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 eyen 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 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. [br] The fourth paragraph of the passage primarily discusses ______.
选项
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
答案
C
解析
主旨大意题。参考译文的第四段可以得知,本段的主要内容可以归结为海参的进食习惯。选项A和D 的内容是第五段讲的,而选项B在第二段已经提到。
转载请注明原文地址:https://tihaiku.com/zcyy/3822585.html
相关试题推荐
[audioFiles]audio_ezf_m_0203(20101)[/audioFiles]Britishwomen,incommonw
Certainlynocreatureintheseaisodderthanthecommonseacucumber.All
NigeriawillreturntotheCommonwealthafter______.[br][originaltext]Com
NigeriawillreturntotheCommonwealthafter______.[br][originaltext]Co
NigeriawillreturntotheCommonwealthafter______.[originaltext]Commonwe
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Husbandandwifewithacommondutytothecountrywillfindthemselves______cl
Whatdogoodnegotiatorsandaveragenegotiatorshaveincommon?[br][original
随机试题
OnthemorningofSeptember11th,IboardedthetrainfromWashingtonHeight
OnAprilthe18th,1960,itwasafewminutesafter5o’clockinthemornin
Bynowyouknowthat【C1】______yourmoney’sworthisnotjustamatteroflu
Americans’circleofcloseconfidantshasshrunkdramaticallyinthepasttw
信息系统是一个复杂的人机系统,系统内外环境以及各种人为的、机器的因素都在不断地变
事业单位工资分配应当结合不同行业事业单位特点,体现岗位职责、工作业绩、实际贡献等
原发性肺动脉高压最不易引起:A.左心力衰竭 B.右心力衰竭 C.晕厥
下列有利于蛀虫生长繁殖的营养物质是A.淀粉 B.糖类 C.脂肪 D.蛋白质
职业生涯管理是组织进行培训与开发的重要内容,()不属于评估其效果的标准。
在对内部控制审计时,下列有关重要账户、列报及其相关认定的说法中,正确的有()。
最新回复
(
0
)