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
A remarkable variety of insects live in this planet. More species of insects exist than all other animal species together. Insec
A remarkable variety of insects live in this planet. More species of insects exist than all other animal species together. Insec
admin
2016-04-30
54
问题
A remarkable variety of insects live in this planet. More species of insects exist than all other animal species together. Insects have survived on earth for more than 300 million years, and may possess the ability to survive for millions more.
Insects can be found almost everywhere—on the highest mountains and on the bottom of rushing streams, in the cold South Pole and in bubbling hot springs. They dig through the ground, jump and sing in the trees, and run and dance in the air. They come in many different colors and various shapes. Insects are extremely useful to humans, pollinating (授粉) our crops as well as flowers in meadows, forests, deserts and other areas. But ticks and some insects, such as mosquitoes and fleas, can transmit disease.
There are many reasons why insects are so successful at surviving. Their amazing ability to adapt permits them to live in extreme ranges of temperatures and environments. The one place they have not yet been found to any major extent is in the open oceans. Insects can survive on a wide range of natural and artificial foods—paint, pepper, glue, books, grain, cotton, other insects, plants and animals. Because they are small, they can hide in tiny spaces.
A strong, hard but flexible shell covers their soft organs and is resistant to chemicals, water and physical impact. Their wings give them the option of flying away from dangerous situations or toward food or mates. Also, insects have an enormous reproductive capacity: An African ant queen can lay as many as 43,000 eggs a day.
Another reason for their success is the strategy of protective color. An insect may be right before our eyes, but nearly invisible because it is cleverly disguised like a green leaf, lump of brown soil, gray lichen (青苔), a seed or some other natural object. Some insects use bright, bold colors to send warning signals that they taste bad, sting or are poison. Others have wing patterns that look like the eyes of a huge predator, confusing their enemies. Some insects also imitate bitter-tasting insects; hungry enemies are fooled into avoiding them.
The passage is mainly about_____.
选项
A、how insects survive in different places
B、why insects can survive so successfully
C、what insects can do to the environment
D、where insects can be found in quantity
答案
B
解析
主旨大意题。本文前两段首先描述了昆虫生存了很长的时间,并能在各种地方生长,然后引出文章要讨论的重点,即昆虫为什么能成功存活。第3段第1句为本文的中心句,因此本题正确选项为B。
转载请注明原文地址:https://kaotiyun.com/show/Ove7777K
0
大学英语四级
相关试题推荐
WhoLives?WhoDies?WhoDecides?A)SomehavecalleditaRighttoDiecase.OthershavelabeleditaRighttoLivecase.Onegr
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
HelicopterMomsVS.Free-RangeKidsA)Wouldyouletyourfourth-graderridepublictransportationwithoutanadult?Probablynot
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
UniversitiesBranchOutA)Asneverbeforeintheirlonghistory,universitieshavebecomeinstrumentsofnationalcompetitionas
Imagineananimalthatbecomesfrozenincoldweather.Then,whenitgetswarmer,theanimalsimplyunfreezesandgoesbacktoi
HelicopterMomsVS.Free-RangeKidsA)Wouldyouletyourfourth-graderridepublictransportationwithoutanadult?Probablynot
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
Theygotooneoftheworld’smostprestigiousuniversitiesandpridethemselvesontheirsuperiorintellectbutalmosthalfof
随机试题
A.末梢神经炎B.高尿酸血症C.过敏反应D.听力障碍E.球后视神经炎利福平的主要不良反应为
A、中性粒细胞增多B、成熟淋巴细胞增多C、嗜酸性粒细胞增多D、单核细胞增多E、嗜碱性粒细胞增多传染性淋巴细胞增多症()。
根据我国现行规定,对于生产单一产品的项目,一般以()划分项目等级。
关于施工特种作业人员应具备条件的说法,正确的是()。
关于常用混凝土的性能和技术要求,说法正确的是()。
一种具有法律约束力的中期周转性票据发行融资的承诺是()。
某企业明年生产一种产品,该产品每件单价850元,单位变动成本为600元,固定成本为56万元,盈亏平衡图如下:根据以上资料,回答下列问题:企业为了在下一年度增加利润,可采取()措施。
根据《合同法》的规定,以下合同不得转让的有()。
甲与乙在讨论有关成功人士的问题。甲:在当今成功的人中,已经很难找到没有接受过良好教育的人了。乙:这些成功人士所经历的改革开放时代,给他们提供了现在人难以遇见的机会。乙对甲的回答能够加强下面哪个论断?()
结构化程序设计的基本原则不包括( )。
最新回复
(
0
)