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
2024-06-16
24
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
mechanisms
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3636504.html
相关试题推荐
Scientistsfindthathard-workingpeoplelivemuchlongerthanaverageme
Scientistsfindthathard-workingpeoplelivemuchlongerthanaverageme
Wehaveproducedtwiceasmuchsteelthisyear______4yearsago.A、thanwedidB
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
Thefarmercancontinuetosupporthimselfandhisfamilyonlyifheproducesa
Scientistshavedonealotofstudytoshowthatpraiseisfar(effective)_______
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
ValmontIndustries,Inc.isaleadingproduceranddistributorofproduct
ValmontIndustries,Inc.isaleadingproduceranddistributorofproduct
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand_______
随机试题
AnnaDouglaswas72yearsoldwhenshestartedwritinghernewspapercolumn
TheFrenchvisitor’sEnglishwassopoorthathefounditdifficulttomakehims
HowtoFindTimeforYourselfI.Introduction:waystoc
[originaltext]M:Whatdoyouthinkisthemostimportantpartintheworkofli
[originaltext]W:YouAmericansarefunny.Itseemsasifyouweremarriedwith
微博(microblog)是近几年开始兴起的一种社交网络服务。简单地说,就是将不超过140个字的几句话或者图片,通过电脑或手机发到微博上,随时随地和朋友
Asfoodistothebody,soislearningtothemind.Ourbodiesgrowandmusc
支付工资最少的企业是()。 A.甲企业B.乙企业C.丙企业D.丁企
患儿,男,10岁。患急性淋巴细胞白血病入院。治疗方案中有环磷酰胺。在化疗期间要特
A. B. C. D.
最新回复
(
0
)