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
26
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、Insects are the most adaptable creatures.
B、Insects would be out of control if nothing were done about the current situation.
C、Insects will someday devour all plants on the Earth,
D、Insects have developed resistance to both botanical and artificial poisons rapidly.
答案
B
解析
“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.”,从这句话我们可以看出如果不对目前的形式采取措施,迟早有一天,害虫们将会失去控
转载请注明原文地址:https://tihaiku.com/zcyy/3826126.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.
Whatelectionarethespeakersdiscussing?[originaltext]M:Comeon,Jully,how’
Whatdoesthewomanmeanbysaythathermotherwaslikethepope?[originaltext
[originaltext]Balloonshavebeenusedforsportsforaboutonehundredyea
Whendidtheunemploymentratebegintoincrease?[br][originaltext]TheU
Whendidtheunemploymentratebegintoincrease?[originaltext]TheU.S.ec
随机试题
Scientistscandeterminesomeone’sfavoritefoodfromtheirbodyshape.The
器官移植排斥中,不会产生相互作用的细胞是A.Th细胞与B细胞 B.Th细胞与B
A.连朴饮B.二妙散C.完带汤D.萆薢分清饮E.桑螵蛸散湿热霍乱,治宜选用
患者女,34岁。剧烈腹泻水样便伴呕吐1天。无腹痛。查体,疲倦面容,皮肤、唇舌干燥
A.防止药物滥用 B.保证分装准确无误 C.保证发药正确率 D.保证药品质
对于ctm检查,其ctm所对应的较高点出现在()。A.始发地到中途分程点,与销售
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
动机是激励和维持人的行动,并将使行动导向某一目标,以满足个体某种需要的内部动因。
在包衣液的处方中,可作为肠溶衣材料的是A.丙二醇 B.醋酸纤维素酞酸酯 C.
与施工总承包模式相比,施工总承包管理模式的优点有( )。2017A、整个建设项目
最新回复
(
0
)