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
2016-10-07
29
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/KwY7777K
0
大学英语四级
相关试题推荐
A、Becauseitwaseasytofind.B、Becauseitcouldbemadeintodifferentdesigns.C、Becauseitwaseasiertotakearound.D、Beca
Weoftenpassonlittlebitsofinformationtoourchildren,notknowingiftheyaretrue,andonlybecausetheywere【B1】_______
Americansbelievethatindividualsmustlearnto【B1】_______themselvesorrisklosingfreedom.Thismeansachievingbothfinanci
Americansbelievethatindividualsmustlearnto【B1】_______themselvesorrisklosingfreedom.Thismeansachievingbothfinanci
Inrecentyears,moreandmoreforeignersareinvolvedintheteachingprogramsoftheUnitedStates.Boththeadvantagesandth
Inrecentyears,moreandmoreforeignersareinvolvedintheteachingprogramsoftheUnitedStates.Boththeadvantagesandth
Inrecentyears,moreandmoreforeignersareinvolvedintheteachingprogramsoftheUnitedStates.Boththeadvantagesandth
Thepointoffactoryfarmingischeapmeat,madepossiblebyconfininglargenumbersofanimalsinsmallspaces.Perhapsthegre
Somepeoplesaythetraditionalcalendarof180daysnolongermeetstheneedsofAmericansociety.Theypointoutthatstudents
随机试题
Word2010的“视图”功能区中的命令义分成多个组别,均用一条__________分开。
先天性白内障手术有关人工晶状体植入正确的是()
“立即”的拉丁文缩写是
全口义齿初戴时出现恶心呕吐是全口义齿初戴后,患者感觉牙槽嵴普遍性疼痛,面部肌肉酸痛,其可能原因是
隧道防水注浆结束后,宜采取钻孔取芯法对注浆效果进行检查,当检查孔出水量不大于()时注浆效果满足要求。
根据《建设工程安全生产管理条例,发生生产安全事故后,施工单位应当采取措施()。需要移动现场物品时,应当做出标记和书面记录,妥善保管有关证物。
确定混凝土强度等级的依据是()。
下列关于投标报价工作的主要内容中说法不正确的是( )。
企业期末编制资产负债表时,下列各项应包括在“存货”项目中的有()。
微分方程2y”=3y’满足初始条件y(-2)=1,y’(-2)=1的特解为________.
最新回复
(
0
)