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
32
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
Thispartistotestyourabilitytodopracticalwriting.Youarerequiredtow
PreparingforComputerDisastersFires,powersurges,andfloo
Forthispart,youareallowed30minutestowriteanessayentitledHowtoProt
微雨 李商隐初随林霭动,稍共夜凉分。 窗迥侵灯冷,庭虚近水闻。 细雨
住院洁中辅助检查项的记录要求有哪些?
H公司是一家非上市证券公司,丙公司拟将其持有的H公司15%的股权转让给乙公司,委
Thechangeinthatvillagewasmiraculou
作为AI领域目前最成熟的技术,人脸识别正在深入教育行业,在刷脸签到、学员身份查询
体内可转变成为胆汁酸的原料是A.胆汁B.胆红素C.血红素D.胆固醇E.胆绿素
根据《房屋建筑与装饰工程工程量计算规范》(GB50854-2013),地下连续
最新回复
(
0
)