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、Thirsty plants. B、Well-watered plants. C、Quiet plants. D、Healthy plants. A
A、Thirsty plants. B、Well-watered plants. C、Quiet plants. D、Healthy plants. A
admin
2014-04-30
48
问题
We all scream for water when thirsty. But do you know in very hot, dry weather, plants also make faint sounds as if they are crying out for help? You see, in a plant’s stem, there are hundreds of water pipes that bring water and minerals from the soil all the way up to the leaves. As the ground turns dry, it becomes harder and harder for the plants to do this. In severe droughts, plants have to fight to pull out any water available. Scientist Robert Wnter has found out that when it is really bad, their water pipes snap from the tension like rubber bands. When that happens, the whole plant vibrates a little. The snapping pipes make noises 10,000 times more quiet than a whisper. Robert knows that healthy, well watered plants are quiet. He also knows that many insects prefer attacking dry plants rather than healthy plants. How do the insects know which are healthy plants and which are not? Robert thinks that the in sects may listen for the plants that cry. And then they may buzz in to kill. To test this theory, Robert is using a device that can imitate plant cries. He attaches it to a quiet, healthy plant so the plant sounds thirsty. Then he watches the insects to see if they attack more often than usual. If he is right, scientists could use the insects ability against them. They could build traps that imitate crying plants, so when the insects buzz in to eat, they won’t buzz out.
Questions 16 to 18 are based on the passage you have just heard.
16. What do plants do when they are thirsty?
17. What plants do many insects tend to attack?
18. What could scientists do if Robert’s theory proves to be true?
选项
A、Thirsty plants.
B、Well-watered plants.
C、Quiet plants.
D、Healthy plants.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/Xf17777K
0
大学英语六级
相关试题推荐
PlanB:SkipCollegeWhat’sthekeytosuccessintheUnitedStates?OtherthanbecomingarealityTVstar,theansweri
Lookinginfromabroad,muchoftheworldhashistoricallybeenbaffledbyAmerica’sgunlaws.Innoothercountrycanamentall
A、TakeanintensivecourseinGerman.B、GivehisgreetingstoLinda’sparents.C、EstablishafriendlyrelationshipwithLinda.D
Inthemidstofaperiodofrapidlanguageextinction,withalanguageestimatedtodieeverytwoweeks,linguistshavefounda
Theterm"corporatetransparency"hasbecomeratherfashionable.Thebeliefthat"transparencyresultsinresponsibilityandeth
Forthispart,youareallowed30minutestowriteashortessayentitledOntheImportanceofInnovation.Youshouldwriteatl
Allourdreamshavesomethingtodowithourfeelings,fears,longings,wishes,needsandmemories.Ifapersonishungry,orti
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisiscalledacircadianrhythm,andithasbeenstudied【C
A、CreatingAbstractExpressionism.B、Paintingpeopleandanimals.C、Sponsoringanewartmovement.D、Exploringrealisticmethods
A、Itisadvertisingelectronicproducts.B、ItisplanningtotourEastAsia.C、ItissponsoringaTVprogramme.D、Itisgivingp
随机试题
控制小儿风湿热复发首选的药物是
A.神经失用B.节段性脱髓鞘C.轴突变性D.沃勒变性E.神经元变性轴突本身因细胞体合成蛋白质等物质发生障碍或远端受阻不能得到足够的营养所发生的变性和解体称为
下列关于葡萄糖注射液灭菌的叙述中,指出哪一组是正确的①加热灭菌能使pH值下降;②因在高温灭菌时溶液明显变成黄色,故在配制时常加入抗氧剂;③分解产物之一是5-羟甲基呋喃甲醛(5-Hydroxymethyl-2-Furaldehyde);④防止变色可用
下列对雌激素作用的描述,哪一项是错误的
法律关系的三大部分是指()。
受业主委托实施设计阶段和施工阶段的监理时,为了确保进度控制目标的实现,监理工程师不仅要审查设计单位和施工单位提交的进度计划,还要编制( )。
关于室外消火栓进出口口径检查,设置错误的是()。
根据我国法律规定,()不准出境。
下列关于死刑的说法中,错误的是()。
试简要评价辛亥革命。
最新回复
(
0
)