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
12
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
Afterall,thatdreadfulaspectofthethingneverreallytookholdofme;I
TheFinancierwaswrittenby()A.MarkT
屏气发作多见于A、0~2个月 B、2~4个月 C、4~6个月 D、6~10
患者,男,32岁,外生殖器或肛门等处出现疣状赘生物,色灰或褐或淡红,质软,表面秽
制定教学评价标准的依据是()。A.教学目标 B.课程目标 C.教学能力
关于结核分枝杆菌的生物学性状,哪项是错误的?( )A.抗酸染色阳性,细长、稍弯
发起人的出资方式有()。A:货币B:实物C:知识产权D:土地使用权
肾病综合征患者发生血栓最常见的部位是A.肾静脉 B.冠状血管 C.下肢静脉
人工流产负压吸宫术适用于妊娠时间最多不超过A.妊娠6周 B.妊娠8周 C.妊
最新回复
(
0
)