首页
登录
职称英语
[originaltext] (32)Scientists have discovered that plants themselves produce
[originaltext] (32)Scientists have discovered that plants themselves produce
游客
2024-06-02
25
管理
问题
(32)Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. (33) In fact, insects have been eating plants for as many as 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 (34) that farmers use less insecticides. At the moment, farmers (34)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, (34)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 new 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.
(35) Scientists 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、Farmers should use less insecticide:
B、Farmers should use a combination of two or three insecticides at once.
C、Farmers should attract new insects onto the crops certain times.
D、Farmers should regularly spray crops as a precaution.
答案
C
解析
本题选项中A、B、D均可在文中第二段找到相应话语。故正确答案为C。
转载请注明原文地址:https://tihaiku.com/zcyy/3615815.html
相关试题推荐
[originaltext]AbrahamLincolnwasborninKentuckyonFebruary12,1809.Wh
[originaltext]AbrahamLincolnwasborninKentuckyonFebruary12,1809.Wh
[originaltext]W:Hi,Larry,areyouwaitingtoseeProfessorJamison,too?M:Y
[originaltext]W:Hi,Larry,areyouwaitingtoseeProfessorJamison,too?M:Y
[originaltext]W:Jack,wouldyoupleasereadthisletterofapplicationI’veju
[originaltext]W:Jack,wouldyoupleasereadthisletterofapplicationI’veju
[originaltext]W:Jack,wouldyoupleasereadthisletterofapplicationI’veju
[originaltext]W:Jack,wouldyoupleasereadthisletterofapplicationI’veju
[originaltext]W:Whatabeautifulday!It’sashametostayinsideallday.M:
[originaltext]W:Whatabeautifulday!It’sashametostayinsideallday.M:
随机试题
The"formallearning"referstoalllearningwhichtakesplaceintheclassroom
Turntousforlegaladviceatanytime______youneedit.A、whenB、howC、whereD、
Mostpeoplewhotravellongdistancescomplainofjetlag.Jetlagmakesbusin
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetrat
_____________________(你的体验与作者的体验进行对比,使你得出与作者相同或不同的结论),andyourideasdevelopas
[originaltext]M:Say,Lisa,whatareyouwatching?W:AnoldJapanesefilm.I’m
脊髓灰质炎后遗症康复治疗,错误的是( )。A.适应证为有永久性功能障碍,可以配
智力技能的特点是() A.物质性、外显性、简缩性B.观念性、内潜性、简缩性
下列关于代理的说法,不正确的是( )。A.代理人和第三人串通损害被代理人利益的,
应收款项、预付款项及预收款项等都应在资产负债表中的资产类中单独列示。()
最新回复
(
0
)