首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [br] [originalte
What conclusion can be drawn from the scientists’ observation? [br] [originalte
游客
2024-09-28
10
管理
问题
What conclusion can be drawn from the scientists’ observation? [br]
Scientists have discovered that plants themselves pro-duce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man-made poisons--insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done? Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to at-tract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter’s resistance to it.
Scientist hope that these and other measures will post-pone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poi-sons invade our farms and devour our crops.
选项
A、Because farmers use less insecticides now.
B、Because farmers have been using insecticides for many years.
C、Because insects axe using the mechanisms against poisons produced by plants to deal with insecticides.
D、Because insects have been eating plants for many million years.
答案
C
解析
原文已经告诉了我们答案:“Now in-sects are using these same mechanisms to deal with man—made poisons—insecticides,This is why resistance of insects to insecticides has developed so rapidly.”
转载请注明原文地址:https://tihaiku.com/zcyy/3778246.html
相关试题推荐
Thethreesuicidebombingsoccurredin______.[br][originaltext]Itgoesag
Thethreesuicidebombingsoccurredin______.[originaltext]Itgoesagainst
WherewillIraqiPrimeMinisterdeliveraspeechonTuesday?[originaltext]I
Wherecanpeopletakeadulteducationcourses?[originaltext]Millionsofpe
WhatiscommontoallthefilmsproducedinHollywood?[br][originaltext]
WhatiscommontoallthefilmsproducedinHollywood?[br][originaltext]
Themanislookingfor______[br][originaltext]M:Excuseme,Iwonderifyouc
Themanislookingfor______[originaltext]M:Excuseme,Iwonderifyoucouldt
Whattopicarethemanandwomandiscussing?[br][originaltext]M:Ireallyapp
Whattopicarethemanandwomandiscussing?[originaltext]M:Ireallyappreciat
随机试题
PASSAGEONE[br]WhereistheZikavirusspreadingnow?IntheCaribbeanandLati
ChooseTWOletters,A-E.Writethecorrectlettersinboxes30and31onyouran
[originaltext]W:IthinkI’lltakethewholedaytourofthevillage.M:Whyn
帧中继体系结构只包括()A.传输层以上各层 B.物理层和链路层 C.链路
男性,60岁。肝脏撞击伤施行不规则肝叶切除术后并发急性肝衰竭。下列治疗用药,不宜
花木兰锦衣卫刘胡兰小花木棉花孔子A.1 B.2 C.3 D.4
年度培训计划的构成包括( )。A.封面模块 B.目录模块 C.反馈报告模块
新产品鉴定一般分为样品鉴定和小批试制鉴定,样品鉴定的内容主要有()。A:工艺文件
对于编制总概算的一般工业与民用建筑工程而言,单项工程综合概算的组成内容不包括(
男性,25岁。无症状,近日婚前检查发现HBsAg(+),来医院进一步做了HBV两
最新回复
(
0
)