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
2024-05-09
11
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、The use of insecticides should be limited and controlled.
B、A combination of some insecticides should be used at the same time.
C、New insects should be introduced to mate with those that have survived from a certain kind of insecticide.
D、New kinds of insecticides should be explored and developed.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3591497.html
相关试题推荐
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
[originaltext]Thediamondisconsideredthemostfamousandvaluablejewel
[originaltext]Thediamondisconsideredthemostfamousandvaluablejewel
[originaltext]W:3346791.M:Isthatyou,Sue?W:Who’scalling?M:ThisisMik
[originaltext]W:3346791.M:Isthatyou,Sue?W:Who’scalling?M:ThisisMik
[originaltext]M:Hello.W:Hello,John.ThisisFlorenceRichardson.I’msorry
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
随机试题
Angeroftenmakesusuncomfortable.It’suncomfortabletowitnessanduncomf
[originaltext]Qualitiesofarelationshipsuchasopenness,compassionandm
A.instructionsB.hesitationC.faintedD.urgent
【B1】[br]【B2】[originaltext]Microsoftisawell-knowncorporationanditsmain
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
设矩阵是4阶非零矩阵,且满足证明矩阵B的秩
与近代哲学的其他形态相比,德国哲学家具有()A.客观性 B.辩证性 C.体
关于淋病,下列说法正确的是:()A.淋球菌呈肾形或豆形,革兰染色阴性
脊髓震荡是指A:脊髓受压 B:脊髓挫伤 C:脊髓裂伤 D:脊髓血运障碍
引起新生儿窒息的因素不包括A:母亲患糖尿病 B:孕母吸烟 C:手术产 D:
最新回复
(
0
)