首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [originaltext]
What conclusion can be drawn from the scientists’ observation? [originaltext]
游客
2023-11-23
73
管理
问题
What conclusion can be drawn from the scientists’ observation?
Scientists have discovered that plants themselves pro- duce many poisonous chemicals for defense 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 insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to at-tract 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.
Scientist 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、Insects have developed some sort of resistance to man-made poisons.
B、Insects have been eating plants for about 250 million years.
C、Farmers sometimes use a combination of two or three insecticides at once.
D、New insects mate with insects which survived from a certain kind of insecticide.
答案
A
解析
“Scientists have discovered that plants themselves produce many poisonous chemicals for defense 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 thes
转载请注明原文地址:https://tihaiku.com/zcyy/3211555.html
相关试题推荐
PassageTwoWhatconclusionmightbedrawnaboutthecurrentmodelsonmalar
PassageTwo[br]Whatistheconclusionofthewholepassage?Universities’t
PassageThree(1)Don’talwaysbelievewhatscientistsandotherauthori
PassageThree(1)Don’talwaysbelievewhatscientistsandotherauthori
PassageThree(1)Don’talwaysbelievewhatscientistsandotherauthori
Howmanyattacksandclasheswerereportedinthisnews?[br][originaltext]
Accordingtothecourtruling,Israelhasto[br][originaltext]TheInterna
Accordingtothecourtruling,Israelhasto[originaltext]TheInternational
Wheredoesthisconversationmostlikelytakeplace?[br][originaltext]M:Hell
Whatisthemaintopicofthisconversation?[originaltext]M:Weseemtobehavi
随机试题
TheWorldHungerCounciliscommittedtodoingallwecantofighttheproblems
Ihavesuggestedthatself-actualizerscanbedefinedaspeoplewhoarenolo
Thisconversationismostlikelytotakeplace______[br][originaltext]M:Hi,
Yournewproductwouldnothavesoldsowellbutforalotofadvertisementswe
"Wheredoyoucomeinyourfamily?"AccordingtoFrankSulloway,aUSsocio
[originaltext]W:Iwouldlikeeveryonetohandinhistermpaperthislessonto
处的值为:
产业政策的核心包括()。 ①产业结构政策 ②产业组织政策 ③产业技术政策
释药速度与肠胃pH无关的是A.膜控包衣型 B.渗透泵型 C.乳剂分散型 D
关于储罐的充水试验,下列符合规定的有( )。A.充水试验前,所有与严密性试验有关
最新回复
(
0
)