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
2017-11-17
33
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/gJa7777K
0
大学英语四级
相关试题推荐
TheUSCongressA)TheUScongressisthelegislativebranchofthefederalgovernment.Itisabicameral(两院制的)law-making
Inamomentofpersonalcrisis,howmuchhelpcanyouexpectfromaNewYorktaxidriver?Ibeganstudyingthisquestionandfou
Fortheemployee,beingplacedinapositionthatiscomfortableandmeetsexpectationswillmakethejoblessstressfulandall
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangiveinformation;wealsoexpressourfeelingsaboutwha
Forthispart,youareallowed30minutestowriteashortessayentitledIsBeingQuietAnUnfavouredPersonality?followingth
Juicemaybetasty,butit’snotreallythatnourishing.Whileorangejuiceisan【B1】_____sourceofvitaminC,itdoesn’tconta
A、Thinkabouthowtoconnectpeoplearoundtheworld.B、Toattractlargenumberofinternationaltalenttogether.C、Discusshow
A、Domedicalcheckupregularly.B、Avoidmakingnoise.C、Limitexposuretoharmfulnoise.D、Liveintheplacewithoutnoises.C录音
A、Topayfortransportation.B、Tomakeaphonecall.C、Todoshopping.D、Togivethemtothewoman.A女士问男士有没有零钱,她想打个电话。男士说“抱歉,我只
随机试题
多媒体产品可分为___________、___________、___________三种类型。
从物理连接上看,计算机网络不包括以下____。
患者头面部皮肤焮红灼热,肿胀疼痛,边界清楚,伴恶寒发热,脉洪数,宜选何方
医院工作人员在医院内获得的感染属于
A.制剂工艺B.处方因素C.贮藏条件D.防止氧化E.延缓水解影响中药制剂稳定性的因素中:温度越高,大多数药物的反应速度常数k值越大是()。
影响药物代谢的因素有
人力资源管理者通过各种激励方案的设计激发员工更积极和主动地工作。这种描述的是人力资源管理的()角色。
随着信息理论、计算机模拟等研究的进展,人们试图将人类学习的过程与计算机处理信息的过程进行类比。依据信息加工观点,所有的学习过程都是通过一系列的内在心理动作对外在信息进行加工的过程,这个信息加工的过程主要包括信息的输入、加工处理与输出。根据信息加工观点,研究
对于长度为n的线性表,在最坏情况下,下列各排序法所对应的比较次数中正确的是
B语言学概念的实例分析。Semanticallydifferentsynonyms意为“语义不同的同义词”,指语义相近但是略有不同的几个单词。
最新回复
(
0
)