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
2023-09-01
46
管理
问题
Scientists have observed that plants themselves produce many poisonous chemicals for defence 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 poisons at the same time.
The most surprising suggestion, perhaps, is that, at certain times of the year, farmers 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 eat our crops.
选项
A、Plants can produce some poisonous chemical for defence against insects.
B、Insects have been eating plants for many million years.
C、Insects have developed ways of dealing with poisonous chemicals produced by plants themselves.
D、Insects have already developed some resistance to man-made poisons.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2975230.html
相关试题推荐
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]I’dliketosharewithyoutodaymyexperiencewithanewap
[originaltext]I’dliketosharewithyoutodaymyexperiencewithanewap
[originaltext]WhenMidoriwastwoyearold,sheoftenclimbedontothepiano
[originaltext]Recently.amanwhowasalwaysi13goodhealth,spentaweek
[originaltext]Climateresearchersstilldonotagreeonwhethertheearth
[originaltext]W:I’mgoingtoleaveworkearlytoday.There’sadebatethiseve
随机试题
Whatdoyouliketoread? Ireadallkindsofbooks,butIhavemyfavouritewr
[originaltext]M:Congratulations!Iknowyougotanewjob.Whendoyoustartt
Thispartistotestyourabilitytodopracticalwriting.Youarerequiredtoc
Somepsychologistsmaintainthatmentalactssuchasthinkingarenotperfor
Streetfoodisfoodthatisprepared,soldandeatenoncitystreets.Street
防坠安全器是防止吊笼坠落的机械式安全保护装置。用于施工升降机,其作用是()。A
女性,25岁,因车祸致小腿胫前皮肤缺损,7cm×9cm大小,胫骨皮质外露,下列哪
2013年二季度,我国税收月收入同比增速逐步提高,分别为7.9%,8.3%和12
批准文号为国药准字J20080027的药品,J代表A.化学药品B.生物制品C.进
不是IgG分子所具有的生物学功能是哪一项A.参与主动免疫 B.结合SPA C
最新回复
(
0
)