首页
登录
职称英语
[originaltext] Scientists have observed that plants themselves produce many
[originaltext] Scientists have observed that plants themselves produce many
游客
2023-06-28
13
管理
问题
Scientists have observed 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—insecticide. This is why resistance of insects to insecticide has developed so rapidly. What should be done? Scientists studying the problem suggest that farmers use less insecticide. 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 insecticide at once. To survive, the insects would need to become resistant to two or more poisons 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.
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 our poisons invade our farms and devour our crops.
19 What does the speaker say about plants?
20 What is mentioned as one of the suggestions raised by scientists?
21 What is the most surprising suggestion scientists give?
选项
A、Changing the way of spraying crops.
B、Buying some outdoor insect lamps.
C、Using a combination of three insecticide.
D、Trying to attract new insects onto the crops.
答案
D
解析
短文提到,应对害虫耐药性最不寻常的建议是,在一年的某些时候尝试吸引别的昆虫来田间,D正确。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2789652.html
相关试题推荐
[originaltext]Manisalandanimal,butheisalsocloselytiedtothesea.
[originaltext]ForalongtimeAmericanspreferredthingswhichweremasspr
[originaltext]ForalongtimeAmericanspreferredthingswhichweremasspr
[originaltext]ForalongtimeAmericanspreferredthingswhichweremasspr
[originaltext]ThomasTommyCarterisaplantscientistinNorthCarolinaHe
[originaltext]W:Andy,whathobbywouldyoutakeupifyouhadmoretime?M:I
[originaltext]W:Tony,you’vebeenaracing-driverfornearly10years.You’ve
[originaltext]W:Tony,you’vebeenaracing-driverfornearly10years.You’ve
[originaltext]W:Tony,you’vebeenaracing-driverfornearly10years.You’ve
[originaltext]W:Tony,you’vebeenaracing-driverfornearly10years.You’ve
随机试题
20oftheworld’stopeconomiespromisedtohelpIraqloweritsdebtandto
It’snotfairthatyoucomehomeafterabaddayatworkand______yourwifean
[originaltext]W:Yourjacketissobeautiful.Didyourwifemakeitforyou?M
法国的启蒙作家有()A.孟德斯鸠 B.伏尔泰 C.狄德罗 D.弥尔顿
手拉葫芦的适用范围:()。A.起吊轻型构件 B.拉紧扒杆的缆风绳 C.
南方山区农民,双手关节痛1年,查RF1:32阳性。体查:双手多个近端指间关节肿
下列各项中除哪项外,均是大定风珠的组成药物()A.白芍 B.龟板 C.
油剂灭菌适宜的方法是()。A.干烤法 B.燃烧法 C.日光暴晒法 D.臭
在一天的教学活动结束后,要求教师写下自己的经验,并与其指导教师共同分析。这种教学
女性,19岁,大学一年级新生,从山区来到城市上学,自述不能见马路上的汽车,当汽车
最新回复
(
0
)