首页
登录
职称英语
[originaltext] Scientists have observed that plants themselves produce many
[originaltext] Scientists have observed that plants themselves produce many
游客
2024-02-17
57
管理
问题
Scientists have observed 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 these same mechanisms to deal with man-made poisons-insecticide.This is why resistance of insects to insecticide has developed so rapidly.What should be done?Scientists studyilg the problem suggest that farmers use less insecticide.At the moment,famlers 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 jnsecticide at once.To survive,the insects would need to become resistant to two or more poisons at the same time.The most surprising suggestion,perhaps,perhaps,is that,at certain times of the year,famers should actually try to attract new 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.
Scientists 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 our poisons invade our farms and devour our crops.
选项
A、There are 250 million plants eaten by insects.
B、There are fewer plants than 250 million years ago.
C、They have their way of guarding against insects.
D、They have a better immune system than before.
答案
C
解析
短文开头就说到,科学家发现庄稼自身可以产生许多有害的化学物质来抵御昆虫的侵害,即庄稼自有抵制昆虫侵害的方法,C与此含义相符,故正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3459111.html
相关试题推荐
[originaltext]Ofallthestarsthesunisthenearesttotheearth.Million
[originaltext]Ofallthestarsthesunisthenearesttotheearth.Million
[originaltext]Manychangesaretakingplaceinthewayinwhichmenandwom
[originaltext]Pete:HeyMarkus.IhaveaquestionI’dliketoaskyou.Markus:
[originaltext]W:Whodoyouthinkshouldgetthejob?HowaboutMr.Becket?M:
[originaltext]W:Whodoyouthinkshouldgetthejob?HowaboutMr.Becket?M:
[originaltext]W:Whodoyouthinkshouldgetthejob?HowaboutMr.Becket?M:
[originaltext]W:Whodoyouthinkshouldgetthejob?HowaboutMr.Becket?M:
[originaltext]Togetadriver’slicense,youmusttakeaseriesoftests.T
[originaltext]Togetadriver’slicense,youmusttakeaseriesoftests.T
随机试题
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwoma
[img]2012q1/ct_etoefm_etoefwritea_1919_20121[/img]Integrate
MarkTwain’sfirstnovel______,writtenincollaborationwithCharlesD.Warner
公平执行()人证[br]法治()合法监禁E、Q
Skipthatthirdhelpingofroastbeef,savetheplanetanddoyourheartaf
以顽强奋斗体现爱国主义情怀 爱国主义自古以来就流淌在中华民族血脉之中,是中
粮食贸易商可利用大豆期货进行卖出套期保值的情形是()。A.担心豆油价格上涨
健脾生血颗粒除能健脾和胃外,还能A.养阴生津 B.滋阴益气 C.补气养血
关于金融衍生品市场中看涨期权的说法,正确的是( )A.看涨期权的买方可以实现的
露天矿开釆项目竣工环保验收中,生态影响调查选择的环境危害因子有( )。A.局地
最新回复
(
0
)