首页
登录
职称英语
Scientists have discovered that plants themselves produce many poisonous che
Scientists have discovered that plants themselves produce many poisonous che
游客
2023-09-16
13
管理
问题
Scientists have discovered that plants themselves produce many poisonous chemicals for (36)______ against insects. But insects have developed ways of (37)______ with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same (38)______ to deal with man-made poisons—insecticides. This is why (39)______ of insects to insecticides has developed so (40)______.
What should be done? Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers (41)______ spray crops as a (42)______ against problems that are caused by large number of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a (43)______ of two or three insecticides at once. (44)____________.
The most surprising suggestion, perhaps, is that at certain times of the year, (45)____________. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter’s resistance to it.
(46)____________ , which may be resistant to all poisons invade our farms and devour our crops.
[br]
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 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 useless 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 insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide anti 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
答案
rapidly
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3020240.html
相关试题推荐
Scientistsshouldbekept______ofthelatestdevelopmentsintheirresearchare
Scientistsareeagertotalkwithotherscientistsworkingonsimilarproblem.A、
Thescientistswantedtokeeppeople______aboutthebreakthroughintheirexpe
Whatproductdoesthecompanyproduce?_______.[br][originaltext]Goodmor
Whatproductdoesthecompanyproduce?_______.[br][originaltext]Goodmor
Womenaregoingafterequalitythemselvesinsteadofwaitingfororganizationst
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Withthework(do)______,thesescientistsbegantoplananotherresearchproject
Itwasnotuntilthenextmorning______theparentsdiscoveredthechildrendid
随机试题
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
[originaltext]Noscenarioisricherwiththepotentialimpolitenessthanthe
某公路工程原施工网络计划如图6—8所示,该工程总工期为一年,在工程按计划进行14
《临川先生文集》中的“王临川”用的称谓是()。A.别号 B.官爵 C.地望
公积金个人住房贷款的特点有( )。A.期限长 B.利率低 C.互助性 D
内在不经济是指厂商在生产规模扩大时,由于自身原因所引起的产量减少和()。A:质量
人们在实践中既要改造客观世界,又要改造主观世界,二者的关系是 A.对客观世界的
既能平肝潜阳,又能清肝明目,镇惊安神的药物是A.石决明 B.珍珠母 C.牡蛎
甲产品月末在产品数量很小,完工产品与在产品的费用分配采用不计算在产品成本法。4月
甲公司有500名职工,从2020年起实行累积带薪缺勤制度,该制度规定,每个职工每
最新回复
(
0
)