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
2018-05-09
27
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/iI47777K
0
大学英语四级
相关试题推荐
HalloweenA)OnOctober31st,dozensofchildrendressedincostumesknockontheirneighbors’doorsandyell"TrickorTreat
HalloweenA)OnOctober31st,dozensofchildrendressedincostumesknockontheirneighbors’doorsandyell"TrickorTreat
InonlytwodecadesAsianAmericanshavebecomethefastest-growingU.S.minority.Astheirchildrenbeganmovingupthroughthe
AnewreportreleasedbytheAmericanFederationofTeachers(AFT)remindsusofatopiceducationwritersalmostneveraddress—th
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
KeepOurSeasCleanA)Bytheyear2050itisestimatedthattheworld’spopulationcouldhaveincreasedtoaround12billion
Aremarkablevarietyofinsectsliveinthisplanet.Morespeciesofinsectsexistthanallotheranimalspeciestogether.Insec
HintsandTipstoSaveMoneyA)Spendless.Thisisnotoversimplifyingthebestwaytosavemoney!Itisessentialifyoua
"Youneedanapartmentaloneevenifit’soveragarage",declaredHelenGurleyBrowninher1962bestsellerSexandtheSingle
随机试题
简述产业购买者的行为类型有哪些。
A.肺脓肿B.肺褐色硬化C.肺结核D.肺肉质变小叶性肺炎的常见并发症是
关于减刑、假释案件的审理,下列选项正确的是:()
下列短期负债筹资方式中,属于商业信用形式的有()。
自然规律必须通过人的理性思维来把握,因此人的理性能为自然界立法。()
在社会主义市场经济条件下,价格应当由()形成。
Mother:Tom,it’s7:30,you’regoingtobelateforschool.Tom:Ifeellikeanotherfiveminutes’sleep.Mother:______Getdress
使用白盒测试方法时,设计测试用例应根据()。
Computersmayonedayturnnightintoday-withgoodold,naturalsunlight.Giantcomputer-controlledmirrors,thousandsoff
Educationistheprocessoflearningandknowing,whichisnotrestrictedtoourschooltext-books.Itisaholisticprocessan
最新回复
(
0
)