首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [br] [originalte
What conclusion can be drawn from the scientists’ observation? [br] [originalte
游客
2023-11-15
37
管理
问题
What conclusion can be drawn from the scientists’ observation? [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-madepoisons--insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done? Scientists studying the problem suggest that farmers use less 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 and 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
A、Because farmers use less insecticides now.
B、Because farmers have been using insecticides for many years.
C、Because insects arc using the mechanisms against poisons produced by plants to deal with insecticides.
D、Because insects have been eating plants for many million years.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3189601.html
相关试题推荐
Scientistsfirst______theideaoftheatomicbombinthe1930s.A、perceivedB、c
Whatdoesitmeanbymentioning"oppositesidesoftheworld"?[br][originalte
Whatdoesitmeanbymentioning"oppositesidesoftheworld"?[br][originalte
Whatdoesitmeanbymentioning"oppositesidesoftheworld"?[originaltext]
HowmanyoverseasvisitorstraveledtoNewYorkcityin2007?[originaltext]
WhenRodLavergotbehind,hewould[br][originaltext]RodLaverwasaten
WhenRodLavergotbehind,hewould[br][originaltext]RodLaverwasaten
WhenRodLavergotbehind,hewould[originaltext]RodLaverwasatennis"g
Thebesttitleforthisselectionis[originaltext]Doyouknowhowastronau
Whatisthedisadvantageofanexcursionfare?[originaltext]T:Goodmorning.Ca
随机试题
Businessandgovernmentleadersalsoconsidertheinflationratetobeanim
AsTouristsCrowdOutLocals,VeniceFaces"Endangered"List[A]On
下列关于两波形梁板的分类正确的是()。A.按截面形状分为等截面和变截面护栏
导游员送散客乘火车时应做好的工作有()。A:安排从贵宾候车室上车 B:将他们介
2016年9月,我国开始实施中小学德育课程是A.心理健康教育 B.道德与法制
共用题干 于先生是一家公司的业务经理,年薪10万,他打算把一部分资金投资在股票
患儿男,7岁,诊断为流行性腮腺炎,护士给予健康指导不正确的是A、睾丸肿痛时可用丁
有助于判断大隐静脉瓣膜功能的检查是( )。A.Perthes试验 B.Tre
下列关于杠杆比率指标的计算公式中,错误的是()。A.资产负债率=(负债总额
慢性肾盂肾炎诊断的主要依据A、影像学检查有局灶粗糙的肾皮质瘢痕,伴有相应的肾盏变
最新回复
(
0
)