首页
登录
职称英语
[originaltext] Scientists have discovered that plants themselves produce many
[originaltext] Scientists have discovered that plants themselves produce many
游客
2024-05-08
44
管理
问题
Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. In fact, insects have been eating plants for as many as 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 insecticides 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 poisons invade our farms and devour our crops.
选项
A、Because farmers use less insecticides now.
B、Because farmers have been using insecticides for many years.
C、Because insects use the mechanisms against plants to fight insecticides.
D、Because insects have been eating plants for many million years.
答案
D
解析
Why did the resistance of insects to man-made insecticides develop so rapidly?
四个选项都是Because开头的句子,由此可以推测,本问题考查的内容为某件事情的原因。昆虫吃植物的历史已经长达两亿五千万年“In fact, insects have been eating plants for as many as 250 million years”,所以它们的抗杀虫剂性能增长得非常迅速。因为它们已经习惯不断进化,对抗各种植物杀虫剂、人工杀虫剂:Now insects are using these same mechanisms to deal with man-made poisons—insecticides...insecticides has developed so rapidly. 故正确答案为D)。
转载请注明原文地址:https://tihaiku.com/zcyy/3589524.html
相关试题推荐
[originaltext]W:Haven’tyouheardthatProf.Smithwillactasthenewdeanof
[originaltext]W:Haven’tyouheardthatProf.Smithwillactasthenewdeanof
[originaltext]W:Haven’tyouheardthatProf.Smithwillactasthenewdeanof
[originaltext]W:Haven’tyouheardthatProf.Smithwillactasthenewdeanof
[originaltext]W:Haven’tyouheardthatProf.Smithwillactasthenewdeanof
Agrowingnumberofscientistsinsistthatanswerstotheworld’sproblemsw
Agrowingnumberofscientistsinsistthatanswerstotheworld’sproblemsw
Agrowingnumberofscientistsinsistthatanswerstotheworld’sproblemsw
Agrowingnumberofscientistsinsistthatanswerstotheworld’sproblemsw
Agrowingnumberofscientistsinsistthatanswerstotheworld’sproblemsw
随机试题
TheartofpublicspeakingbeganinancientGreeceover2,000yearsago.Now
AreTeenagersReallyCarelessAboutOnlinePrivacy?[A]Theyshare
FiveThingsforCollegeGraduatestoKnowI.Degreedoesno
[originaltext]W:Hello,isthat3422897M:Yes,itis.W:I’minquiringaboutt
设为3阶矩阵,将的第2列加到第1列得矩阵,再交换的第2行与第3行得单位矩阵,记,
在我国历史上,传统音乐与外族音乐、北方与南方音乐进行广泛交流的时期是()。A.
(2016年真题)关于股票拆分和股票股利,下列说法错误的是()。A.不改变
证券公司客户资产管理业务投资主办人应当在()进行执业注册。?A:中国证监会
饥不欲食可见于A.胃火亢盛 B.胃强脾弱 C.脾胃湿热 D.胃阴不
2011年1月,宁波佳杰公司(A类企业、非联网监管)与境外A公司、上海宇辰光电材
最新回复
(
0
)