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
2023-09-09
14
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://www.tihaiku.com/zcyy/2999549.html
相关试题推荐
[originaltext]Anewreportsaysthecostofstudiesatpubliccollegesint
[originaltext]Today,airtravelisfarsaferthandrivingacaronabusym
[originaltext]Today,airtravelisfarsaferthandrivingacaronabusym
[originaltext]Motivationcancomefromthreesources,twoofthemexternal
[originaltext]M:Hi,Diana.MindifIsitdown?W:Notatall,Jack.Howhavey
[originaltext]M:Hi,Diana.MindifIsitdown?W:Notatall,Jack.Howhavey
[originaltext]W:Goodevening,professorMynameisAliceBrown.M:Goodevenin
[originaltext]W:Goodevening,professorMynameisAliceBrown.M:Goodevenin
[originaltext]W:Whydidn’tyougotothehockeyfinalslastweekend?Youmisse
[originaltext]W:Whydidn’tyougotothehockeyfinalslastweekend?Youmisse
随机试题
Editorsofnewspapersandmagazinesoftengotoextremesto【C1】______theirr
Forthewriterswhofirstgavefeudalismitsname,theexistenceoffeudalismpr
______arethetwopartiesdominatingthepoliticalsceneintheU.S.A、Conservati
[originaltext]Now,listentoPartTwooftheinterview.M:InGazaCity,would
小儿望诊中望神的重点是A.察口 B.察舌 C.察耳 D.察鼻 E.察目
在shibor利率的发布流程中,每个交易日全国银行间同业拆借中心根据各报价行的报
(2020年真题)关于公民的基本权利,下列选项错误的是?A.对于公民的申诉、控告
某房地产企业同时有两个房地产项目的投资机会,每个项目又有若干个投资方案可供选择。
“十二五”时期国家关于加快发展现代农业的任务和措施有()A:增强粮食安全保障能力
在钢筋加工工程中,关于钢筋的调直和清除污锈的说法,正确的是()。A.钢筋中心线同
最新回复
(
0
)