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
22
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
InonlytwodecadesAsianAmericanshavebecomethefastest-growingU.S.minority.Astheirchildrenbeganmovingupthroughthe
AnewreportreleasedbytheAmericanFederationofTeachers(AFT)remindsusofatopiceducationwritersalmostneveraddress—th
Divorcedoesn’tnecessarilymakeadultshappy.Buttoughingitoutinanunhappymarriageuntilitturnsaroundjustmightdo,a
SomeAmericansarealittlenervousaboutthenation’sfuture,butothersfeelsecure,knowingthatthemantheyconsiderthemo
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
DevelopHealthyEatingHabitsinYourChildrenA)Whatdoyouthinkyourchildrenareservedatschool?Thechildrenwereser
Aremarkablevarietyofinsectsliveinthisplanet.Morespeciesofinsectsexistthanallotheranimalspeciestogether.Insec
A、Theyareindecliningatahighrate.B、Theyoffermanyresourcestohumans.C、Theyhelptostorecarbondioxide.D、Theyincre
随机试题
发动机在某一转速发出的功率与同一转速下所可能发出的最大功率之比称为_______。
A、黏液脓血便B、柏油便C、米泔样便D、蛋花汤样便E、果酱样便霍乱的大便性状是
规划咨询中,关于规划研究的内容一般有发展战略目标研究、发展思路和开发方案研究()、产业结构和产业政策研究、投资方案和备选项目研究等几个方面。
公安工作的群众路线,是党和政府的群众路线在公安工作中的具体体现。()
沂源:苹果:水果
成语“寸草生晖”出自下列哪首诗?
相对于其他作品,史书有太多芜杂的琐碎记载,把主线_______得有些模糊不清。然而细节有细节的_______之处,因为虽然撰写史书的史官难免受到某些思维导向的影响,有意无意地隐此扬彼,但所谓“细节之中有魔鬼”,某个历史人物的性格总会在一些细节之中_____
下列哪个行为不构成故意杀人罪?()
在微型计算机的一条指令中,______执行的是功能的部分,即计算机执行怎样的操作。
Afterthenewtechniquewasintroduced,thefactory______(1998年生产的电视机是前一年的两倍多).
最新回复
(
0
)