首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Certainly no creature in the sea is odder than the common sea cucumber. All living creatures, especially human beings, have thei
Certainly no creature in the sea is odder than the common sea cucumber. All living creatures, especially human beings, have thei
admin
2017-03-25
65
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-colored 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 their 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 the 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 the water becomes too polluted.
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
题目问:文章第四段主要讨论什么内容?第四段Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic ratefeeding sparingly or not at all ior long periods,so that the marine organisms that provide their food have a chance to multiply.通过这句话可知,虽然海参有个贪婪的胃,它们能整日地进食,但是由于它们能够以很低的新陈代谢水平生存,所以又能很长时间不进食。据此判断,应选择C。
转载请注明原文地址:https://kaotiyun.com/show/1lGO777K
0
考博英语
相关试题推荐
Whenyouleaveajobwithatraditionalpension,don’tassumeyou’velostthechancetocollectit.You’reentitledtowhatever
AsmanyasoneinfourU.S.workersmaybechronicallyangryonthejob,withangryemployeesalsomorelikelytobebored,hav
EndangeredSpeciesEndangeredspeciesareplantsandanimalsthatareinimmediatedangerofextinction.Extinctionisactua
AlthoughmanypeoplespeakEnglish,theydon’tpronounceitorspellthewordtheyusethesameway.TheUnitedStates,in【C1】__
Inrecentyears,therehasbeenasteadyassaultonsaltfromthedoctors:saltisbadforyou—regardlessofyourhealth.Poli
Don’tcallhimjustacollegeprofessor.Internetentrepreneur,TVpersonality,advisertopresidents,andfriendtotherichan
Inolddays,whenaglimpseofstockingwaslookeduponassomethingfartooshockingtodistracttheseriousworkofanoffice,
Now,morethanever,itdoesn’tmatterwhoyouarebutwhatyoulooklike.Janetwasjusttwenty-fiveyearsold.Shehadag
Hefailedtocarryoutsomeoftheprovisionsofthecontract,andnowhehasto___theconsequences.
Hippiesweremembersofayouthmovementofthe1960’sand1970’sthatstartedintheUnitedStatesandspreadtoCanada,Great
随机试题
(2008年10月)五四时期,研究和宣传马克思主义的社团有________、________、________。
生态修复请求分为生态修复的行为请求和费用请求,前者是为了防止生态环境权益损害的发生或扩大,请求责任人停止污染破坏行为;当被破坏的生态环境无法恢复时,请求责任人进行人工修复。如果责任人不具有修复能力或意愿,可请求责任人承担修复费用。因此,修复行为请求应作为首
不得用于弥补公司亏损的是()
人们对整个世界的总体看法和根本观点就是()
患者,男,55岁。患腹股沟斜疝,今日上午手术,为防止术后出血,切口部位压沙袋,压迫的时间是
双端固定桥固定-可摘联合桥
[2005年第119题]采用净现值(NPV)、内部收益率(IRR)和差额内部收益率(△IRR)进行互斥方案比选,它们的评价结论是()。
钢筋混凝土桥梁施工时,混凝土浇筑前应进行检查,检查钢筋及预埋件的位置、规格,还要检查()。
根据《车辆购置税暂行条例》的规定,下列车辆中可以减免车辆购置税的有()。
A、 B、 C、 D、 A第一组图形中,第一个、第二个图形对称翻转后相加得到第三个图形。第二组图形有同样规律。所以选A。
最新回复
(
0
)