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
27
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、Insects Out of Control
B、An Urgent Challenge in Agriculture
C、How to Use Insecticides Properly
D、Insects and Insecticides
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2975233.html
相关试题推荐
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
[originaltext]I’mhavingproblemslivingwithColin.We’vebarelyspokento
[originaltext]I’mhavingproblemslivingwithColin.We’vebarelyspokento
[originaltext]W:Hello,Dr.Christianson.M:Hello,Cathy,whatcanIdoforyo
[originaltext]W:Hello,Iboughtthislaptopcomputeralittleoveramonthago
[originaltext]W:Hello,Iboughtthislaptopcomputeralittleoveramonthago
[originaltext]W:I’mscurry,Mike.Ihavetoputoffourmeetingtillfouro’cl
[originaltext]W:I’mscurry,Mike.Ihavetoputoffourmeetingtillfouro’cl
[originaltext]W:I’mscurry,Mike.Ihavetoputoffourmeetingtillfouro’cl
随机试题
Itis(reason)______forparentstopayfortheirchildren’seducation.reasonable
[originaltext]Thisisthecentraldistrictandit’s11o’clockatnighttim
某试验室对水泥混凝土用砂进行筛分试验,以检测砂样的级配情况。试验结果如下表。根据
A.下牙槽神经 B.颏神经 C.舌神经 D.颊神经 E.舌下神经支配下颌
A.尊重患者的生命价值,确立双向作用的医患关系 B.扩大医学服务的范围 C.
共用题干 EasternQuakescanTriggerBigSha
对患有消化性溃疡的患者不适合应用的药物是A.美托洛尔B.利血平C.可乐定D.哌唑
夸美纽斯于1632年发表的《_()》奠定了班级授课制的理论基础。
期货公司因延误执行客户交易指令给客户造成损失的免责事由为()。A.期货公司内
在流水施工中,用来表达流水施工在空间布置上开展状态的参数是( )。A.流水强度
最新回复
(
0
)