首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [originaltext]
What conclusion can be drawn from the scientists’ observation? [originaltext]
游客
2024-11-01
25
管理
问题
What conclusion can be drawn from the scientists’ observation?
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 postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
选项
A、Insects have developed some sort of resistance to man-made poisons.
B、Insects have been eating plants for about 250 million years.
C、Farmers sometimes use a combination of two or three insecticides at once.
D、New insects mate with insects which survived from a certain kind of insecticide.
答案
A
解析
“Scientists have discovered that plants themselves produce 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 thes
转载请注明原文地址:https://tihaiku.com/zcyy/3826123.html
相关试题推荐
WhatisthepurposeofthemeetinginLuxembourg?[br][originaltext]TheW
WhatisthepurposeofthemeetinginLuxembourg?[br][originaltext]TheW
PresidentProsperAvrilhasbeenarrestedonchargeof______.[originaltext]
WherewasSberrillgoingwhenFillmether?[br][originaltext]M:Hi,Sherril.
WherewasSberrillgoingwhenFillmether?[originaltext]M:Hi,Sherril.W:Hel
Whatelectionarethespeakersdiscussing?[br][originaltext]M:Comeon,Jully
Whatelectionarethespeakersdiscussing?[originaltext]M:Comeon,Jully,how’
Whatdoesthewomanmeanbysaythathermotherwaslikethepope?[originaltext
Whendidtheunemploymentratebegintoincrease?[originaltext]TheU.S.ec
Howmanypeoplediedinlastmonth’sriot?[br][originaltext]AnEthiopian
随机试题
PreparingforTestsWhatyouneedtounderst
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Somepsychologistsmaintainthatmentalactssuchasthinkingarenotperfor
[originaltext]M:Howabouttheexaminationlastweek?W:IfI’dgotmoretime,
Inorderto“changelivesforthebetter
现金及银行存款日记账按规定应采用订本式账簿,总分类账和明细分类账既可以用订本账,
一、题目 试述稳步推进利率市场化改革的必要性 二、背景与答题要求 中
(2020年真题)关于公募基金的投资与交易行为的限制,以下说法错误的是(
2012年1-4季度该市人均可支配收入中,增长量最大的是:() A.工资性
一例涎腺切除样本的镜下以腺实质萎缩、间质淋巴细胞浸润和上皮肌上皮岛形成为主要特点
最新回复
(
0
)