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
2024-11-01
3
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 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、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/3826124.html
相关试题推荐
WhatisthepurposeofthemeetinginLuxembourg?[br][originaltext]TheW
PresidentProsperAvrilhasbeenarrestedonchargeof______.[br][originalte
WherewasSberrillgoingwhenFillmether?[br][originaltext]M:Hi,Sherril.
WherewasSberrillgoingwhenFillmether?[br][originaltext]M:Hi,Sherril.
WherewasSberrillgoingwhenFillmether?[br][originaltext]M:Hi,Sherril.
WherewasSberrillgoingwhenFillmether?[originaltext]M:Hi,Sherril.W:Hel
Whatelectionarethespeakersdiscussing?[br][originaltext]M:Comeon,Jully
Whatelectionarethespeakersdiscussing?[br][originaltext]M:Comeon,Jully
Whatelectionarethespeakersdiscussing?[originaltext]M:Comeon,Jully,how’
Whendidtheunemploymentratebegintoincrease?[originaltext]TheU.S.ec
随机试题
Humanbehaviorismostlyaproductoflearning,______thebehaviorofanimalsd
Directions:Inthispart,youwillhave15minutestogooverthepassagequickl
[originaltext]M:Ididn’tseeyouincreativewritingclasstoday.Whathappene
Ididn’twanttomakemischiefbetweenthem.Theunderlinedpartmeans_____.A、m
【B1】[br]【B6】A、calculatingB、circlingC、circulatingD、cyclingC词义辨析题。空格所在句的意思
有关会阴部手术患者的护理内容,正确的是A.患者应于术前3天进流质饮食 B.术前
变电检测管理规定仪器仪表保养每年不少于1次,确保处于完好状态
在—些地方,村民委员会组织法的相关规定没有得到真正落实,尤其是该法的一项重要精神
基金管理公司申请境内机构投资者资格,应在()等方面符合《合格境内机构投资者境外证
某男,59岁。半年来,腰酸膝软、盗汗遗精。神疲口燥。证属真阴不足,宜选用的成药是
最新回复
(
0
)