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
34
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
WhenMomandDadGrowOldA)Theprospectoftalkingtoincreasinglyfragileparentsabouttheirfuturecanbe"oneofthemostd
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"butwithoutthedramaticmusic.Ahugesharkwaslowlyswimmingthrough
HelicopterMomsVS.Free-RangeKidsA)Wouldyouletyourfourth-graderridepublictransportationwithoutanadult?Probablynot
HelicopterMomsVS.Free-RangeKidsA)Wouldyouletyourfourth-graderridepublictransportationwithoutanadult?Probablynot
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(ANWR)tohelpsecureAmerica’senergyfuture?PresidentBushcer
Imagineananimalthatbecomesfrozenincoldweather.Then,whenitgetswarmer,theanimalsimplyunfreezesandgoesbacktoi
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
Theygotooneoftheworld’smostprestigiousuniversitiesandpridethemselvesontheirsuperiorintellectbutalmosthalfof
随机试题
A.对症处理B.开胸探查C.气管切开术D.气管前筋膜切开引流E.胸腔闭式引流女性,30岁。不慎跌倒摔伤胸部。诉胸痛。胸片示左第六肋骨骨折,两侧肋膈角清晰。合适的处理为
植物性食物中的铁是()
犯罪嫌疑人在侦查阶段就可以聘请律师。( )
【2010-56】请用行为主义学习观点,分析说明下述各实例中处置学生不当行为的教育措施的心理学依据。对于学生在课堂上的违规行为,教师可能采用各种不同的办法进行处理。下面是5个实例:例一:学生张明在课堂上对邻座做鬼脸,引起对方发笑,老师对
《合同法》第68条规定:“应当先履行债务的当事人,有确切证据证明对方有下列情形之一的,可以中止履行:(一)经营状况严重恶化;(二)转移财产、抽逃资金,以逃避债务;(三)丧失商业信誉;(四)有丧失或者可能丧失履行债务能力的其他情形。当事人没有确切证
新民主主义文化,就是无产阶级领导的人民大众的反帝反封建的文化,即民族的科学的大众的文化。在新民主主义文化中居于指导地位的是
下列选项不属于“计算机安全设置”的是()。
Whatdoesthesentence"Onecaninsultusonlyatone’sownperil"meaninthefirstparagraph?Whatdoesthelastparagraphim
Americandoctorssaythatmotherswhosmokebeforetheirbabiesarebornmayslowthegrowthoftheirbabies’lungs.Theysayre
Mark’spostureandattitude______boredomwhentheteacherwasgivinghisinstructions.
最新回复
(
0
)