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、Its resin(树脂)isn’t poisonous. B、It can shoot its resin a great distance. C、Its leaves have no veins. D、It doesn’ t need much w
A、Its resin(树脂)isn’t poisonous. B、It can shoot its resin a great distance. C、Its leaves have no veins. D、It doesn’ t need much w
admin
2017-02-24
57
问题
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 resin a distance of six feet. You think it would be safe from all attacks by insects. But a recent study has found one insect, a beetle, that can chew its way pass the plant’s defense system by cutting the mainly vein that delivers the poison to the leaves. This vein cutting is just one method the beetles used to prepare a safe meal. Another is by cutting a path all the way across the leave to hold the flow of chemicals. 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. That is, how the insects can neutral or alter the poisonous substances plants produce. What’s unique about this chewing strategy is that the beetle is actually exhibiting a behavior response to the plant’s defenses rather than the more common chemical response. It is only after a beetle’s 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 safe 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. Now listen to the following recording and answer questions 19 to 21.
19. What is the talk mainly about?
20. What is unusual about the desert plant?
21. Except vein cutting How can the beetles avoid being poisoned by the plant?
选项
A、Its resin(树脂)isn’t poisonous.
B、It can shoot its resin a great distance.
C、Its leaves have no veins.
D、It doesn’ t need much water to grow well.
答案
B
解析
细节题。讲座中提到This is about a desert shrub whose leaves can shoot up a stream of poisonous resin a distance of six feet.即“这是关于沙漠灌木的,它的叶子喷出的有毒树脂流达六英尺之远”。因此,正确答案为B。
转载请注明原文地址:https://kaotiyun.com/show/r1U7777K
0
大学英语六级
相关试题推荐
Since2007,theAmericanPsychologicalAssociation(APA)hasconductedasurveyofdifferentaspectsofstressinAmerica.Thisye
IfthepopulationoftheEarthgeesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourcesleftto【B1】
IfthepopulationoftheEarthgeesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourcesleftto【B1】
A、Gooutfishing.B、Cheerupherself.C、Cooksomefishfordinner.D、Dineoutwithhim.D根据对话,女士的烤箱被室友损坏了,男士建议她跟自己去外面吃。故D正确。动词原形
A、Arrogant.B、Weird.C、Genuine.D、Outgoing.B根据男士的描述,那个男子总是盯着他,当他转身的时候,那个人已经悄然无声地站在了他身旁,可以推断出那个人行为古怪。故答案是B。选项是四个形容词,猜测题目与某人的性格有关
Adultsaregettingsmarteraboutbowsmartbabiesare.Notlongago,researcherslearnedthat4-day-oldscouldunderstand【B1】__
A、Allstudentspaythesameamountperyear.B、Studentschoosehowmanymealsaweektheywillpayfor.C、Studentscangetmoney
A、Thewomanisbeinginterviewedbyareporter.B、Thewomanisapplyingforajob.C、Thewomanisaskingforapromotion.D、The
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirthdaysoffamilymembers,atweddings,atChristmasa
A、Incidentsofworkerscausedglobalanger.B、Kafalasystemleavesworkersopentoabuse.C、AnIndonesianworkerwasstarvedto
随机试题
潞金融资产管理公司注册资本金为_______。
在我国社会主义市场经济条件下,如何正确运用集权制、分权制和均权制?
下列符合肺淤血的描述是
腹壁切口疝修补手术后第2天,伤口针眼处稍红肿,此时的处理措施是
铁路运输凡在行车工作中,因违反规章制度、违反劳动纪律、或技术设备不良及其他原因,造成人员伤亡、设备损坏,影响行车及危及行车安全的,均构成()。
负责草拟比较重要的财务会计制度、规定、办法;解释、解答财务会计法规、制度中的重要问题;分析检查财务收支和预算的执行情况等,属于()专业职务的基本职责。
一个民族之所以作出这种或那种选择,其特定的原因包括()
,要限制宏命令的操作范围,可以在创建宏时定义()。
InterpretthefollowingpassagefromChineseintoEnglish.Startinterpretingatthesignalandstopatthesignal.Youmaytake
Wildducksandothermigratory(迁移的)birdscouldbeimportantcarriersofdeadlybirdflu,researcherssay.Evenso,theinfecti
最新回复
(
0
)