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
63
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/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
Throughouthistoryhas【C1】______changedhisphysicalenvironmentinordert
______isgenerallyregardedasJohnSteinbeck’smasterpiece.A、TheSeaWolfB、Th
[originaltext]TheGoldenGateBridgejoinsthebeautifulcityofSanFranci
【S1】[br]【S5】experience由句意可知该处应该是“由于缺乏驾驶经验”才能完成句意,experience符合文义。
围护结构变形小,能够有效控制周围土体的变形和地表沉降,有利于保护邻近建筑物和构筑
确定井田开拓方式的原则包括( )。A.贯彻执行国家有关煤炭工业的技术政策 B
患者,男,62岁,有吸烟史30余年,近十余年晨间咳嗽明显,伴有白色浆液性泡沫样痰
Thechangeinthatvillagewasmiraculou
痛觉没有()。 (A)适宜刺激(B)准确的定位 (C)明确的性质(D
下列组织可以作为一个会计主体进行会计核算的有()。A、独资企业、合伙企业 B、
最新回复
(
0
)