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
Where does the plant grow?
Where does the plant grow?
admin
2010-07-06
41
问题
Where does the plant grow?
This morning I want to tell you about a recent scientific discovery dealing with the relation between plants and animals. This is about a desert shrub whose leaves can shoot up a stream of poisonous rosin for a distance of six feet. Do you think it would be safe from all attacks by insects? But a recant study has found one insect, a beetle, which can chew its way past the plant’s defense system by cutting the main vein that delivers the poison to the leaves. This vein cutting is jut one method the beetles used to prepare a safe meal. Then they simply eat between the veins of poison. In the past, scientists who studied insect adaptation to plant defenses have focused on chemical responses. It is only after a beetle has survived several encounters with the plant’s resin that it learns how to avoid the poison by chewing through the resin transporting veins on the next leaf it eats and thus gives itself a meal. However, it can take a beetle an hour and a half of careful vein cutting to prepare a small leaf that takes it only a few minutes to eat. So, though the method is effective, it’s not very efficient.
选项
答案
veins
解析
转载请注明原文地址:https://kaotiyun.com/show/SHDd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
A=BOOKREVIEW1B=BOOKREVIEW2C=BOOKREVIEW3D=BOOKREVIEW4Whichbookreview(s)contain(s)thefollowinginformation?
Whatdoesthespeakersuggestthatthestudentsshoulddoduringtheterm?
A=BOOK1B=BOOK2C=BOOK3D=BOOK4Whichbook(s)say(s)that...theclimateaffectsthefuturesustainableagricultural
A=BOOK1B=BOOK2C=BOOK3D=BOOK4Whichbook(s)say(s)that...theclimateaffectsthefuturesustainableagricultural
A=BOOK1B=BOOK2C=BOOK3D=BOOK4Whichbook(s)say(s)that...theclimateaffectsthefuturesustainableagricultural
ToproducetheupheavalintheUnitedStatesthatchangedandmodernizedthedomainofhighereducationfromthemid-1860’sto
Whichpassage(s)say(s)that….adultsputtoomuchemphasisonchildren’sintellectualdevelopment?
Whichcontinentwherechildrenaretaughttobesilentinfrontofeldersismentioned?
随机试题
典型的串联型稳压电路由取样、基准、________和调整四个部分组成。
维系蛋白质分子二级结构的化学键是
在金融衍生品市场上,以风险对冲为主要交易目的的市场参与者是()。
支出是指企业所实际发生的各项开支,以及在正常生产经营活动以外的()。
()是影响企业战略决策的首要外部条件。
做“好老师”应该具有理想信念、道德情操、扎实学识和仁爱之心的特质。这是由下列哪位党和国家领导人提出的?()
孔子在中国历史上留下了光辉的文化轨迹,以下关于孑L子的说法正确的是()。
In enterprises, the gateway is the computer that(67)the traffic from a workstation to the outside network that is serving the We
【B1】【B8】
Drunkendrivinghasbecomeanational【C1】______.EveryhourofeverydayaboutthreeAmericansonaveragearekilledbydrunke
最新回复
(
0
)