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、They could drive the insects away. B、They could keep the plants well watered. C、They could build devices to trap insects. D、Th
A、They could drive the insects away. B、They could keep the plants well watered. C、They could build devices to trap insects. D、Th
admin
2016-03-31
29
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、They could drive the insects away.
B、They could keep the plants well watered.
C、They could build devices to trap insects.
D、They could make the plants grow faster.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/jxL7777K
0
大学英语六级
相关试题推荐
Livingnearairportsmightnotonlyleadtoresidentssufferingsleeplessnights—theycouldalsohaveterribleweather,scientis
StartupNuclearEnergyCompaniesAugurSafer,CheaperAtomicPowerA)Nothingcaptureshowfashionablethestartuphasbecomequi
TakingVacationsExperiencesan82PercentIncreaseinJobPerformanceA)Thistimeofyear,manyEuropeansarelookingforwardt
SocialMediaandMarketingA)InMay2013,Ritz-CarltonHotelCo.boughtadstopromoteitsbrandpageonFacebook.Afterafewd
"Iwanttocriticizethesocialsystem,andtoshowitatwork,atitsmostintense."VirginiaWoolf’sprovocativestatementab
TheInternet,e-commerceandglobalizationaremakinganeweconomicerapossible.Bythemiddleofthe21century,capitalistm
Nottoomanydecadesagoitseemed"obvious"bothtothegeneralpublicandtosociologiststhatmodernsocietyhaschangedpeop
A、Hewassatisfiedwiththeserviceontheship.B、Itwasthefirsttimehehadbeenabroad.C、Hehadneverbeenonawarship.D
A、StopbytheCareerServicesCenterandaskforhelp.B、Lookforaninternship.C、Changehismajortoaccounting.D、CalltheCa
随机试题
A.酸B.甘C.淡D.辛E.涩属于阴的味是()
财政分配的主体是国家,这包括几层含义?
对期货投资者的保证金损失,现有期货投资者保障基金不足补偿的,()。
从公元前1046年开始,先后有______个王朝和国家在陕西建都,长达______多年,是中国历史上建都王朝数量最多,累计时间最长的地方。
根据下列资料,回答下列问题。与上一年相比,财政收入增速下降近五成的年份,财政收入比上年度增加()亿元。
有46位男生和30位女生,分别参加化学和生物两项课外小组,每人至少参加一项。女生中只参加化学的人数是只参加一项人数的,女生中参加生物的人数与参加化学的人数之比为3:4。参加生物的全体学生中男生占,那么只参加化学一项的学生人数是多少?
Initiallythewriterdidnotwanttobuyahearingaidbecause______.Accordingtothepassage,hearinglossis______.
Whatisthewomanlookingfor?
Whichwordistheoddoneout?London,Paris,Dublin,TheHague,Vienna
MemorandumTo:WilliamD.Vane,VicePresidentforOperationsFrom:HarryMatthews,PersonnelDepartmentDate.December3,2002
最新回复
(
0
)