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
33
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
TheGulfbetweenCollegeStudentsandLibrariansStudentsra
TowhomdidMs,Tanakatellaboutheridea?[br][originaltext]JapaneseFore
Thepurposeinscanning(快读),asyouknow,istosearchforspecificinformation
桥梁荷载试验加载称量误差不得超过()。A.1% B.2% C.3% D.
关于体液的描述,下列错误的是A.水占全身体重的50%~70% B.男性平均值为
有关抗菌后效应'(PAE)的叙述中,错误的是A.利用PAE可延长给药间隔,减少给
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
共用题干 患者儿童时期颏部受外伤导致颞下颌关节强直,请回答下列问题。若双侧颞下
关于责任保险的说法,正确的是()。 A.责任保险承保一切法律责任 B.责任保
下列选项中属于施工图预算的审查方法是()。A.主要问题复核法 B.查询核
最新回复
(
0
)