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
22
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
dealing
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3636503.html
相关试题推荐
Scientistsfindthathard-workingpeoplelivemuchlongerthanaverageme
Scientistsfindthathard-workingpeoplelivemuchlongerthanaverageme
Wehaveproducedtwiceasmuchsteelthisyear______4yearsago.A、thanwedidB
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand________
ValmontIndustries,Inc.isaleadingproduceranddistributorofproduct
ValmontIndustries,Inc.isaleadingproduceranddistributorofproduct
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand_______
随机试题
______rapidlybythebody,sugarprovidesaquickenergysource.A、DigestedB、Dig
AproverballegedlyfromancientChinawaswidelyspreadintheWest:"Ifyo
A.为避免车辆从路口突然冲出引发危险,应适当降低车速 B.本车有优先通行权,可
砌一砖厚及以上的砖墙必须双面挂线。()
左边的立体图形是立方体中挖出一个圆锥台孔后形成的,如果从任一面剖开,以下哪一个不
下列哪项不是虚劳与肺痨的鉴别要点A.致病原因及病理特点 B.病位所在 C.是
数字表中第2列四个数字之积的个位对应的符号是()。
2004年6月,巴塞尔委员会颁布的《巴塞尔新资本协议》中明确提出,( )形成三
经过统计得到s结果,正确的结论是A.P=0.05,拒绝H,差异有统计学意义 B
我国同业拆借的最短期限为()。A.7天 B.3个月 C.半年 D.1天
最新回复
(
0
)