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
37
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
farmers should actually try to attract insects onto the crops they are trying to Protect
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3020245.html
相关试题推荐
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Bytheendoflastmonth,ourfactory(produce)______3000motors.hadproduced本题考
Scientistsshouldbekept_____ofthelatestdevelopmentsintheirresearcharea
Womenaregoingafterequalitythemselvesinsteadofwaitingfororganizationst
Scientistsareeagertotalkwithotherscientistsworkingonsimilarproblem.A、
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand______.
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand______.
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand______.
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand______.
随机试题
BenjaminFranklinwasAmerica’sfirstinternationallyfamousswimmerandswi
SpeakerA:Hereareourticketsandpassports.We’reflyingtoAmsterdamtoday.
下列有关安全玻璃的叙述,不正确的是()。A.安全玻璃包括夹丝玻璃、夹层玻璃、
关于栓剂基质聚乙二醇的叙述,错误的是A.聚合度不同,其物理性状也不同 B.遇体
在隧道监控量测作业中,各项量测作业均应持续到变形稳定后()结束。A.7~15d
A.咽喉肿痛B.血热出血C.热毒血痢D.虫蛇咬伤E.湿热淋证射干常用于治疗的病证
共用题干 Paperorplastic?Takeawalkalong
在论述教育与经济发展关系中,提出“庶→富→教”这一思路的教育家是( )A.孟子
下列哪种疾病属于免疫性溶血性贫血? A.遗传性球形细胞增多症B.海洋性贫血C
削弱爆破公害强度,在爆源上的控制措施有()。A.选择爆破参数 B.选择装
最新回复
(
0
)