首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [originaltext]
What conclusion can be drawn from the scientists’ observation? [originaltext]
游客
2023-11-15
10
管理
问题
What conclusion can be drawn from the scientists’ observation?
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、Insects have developed some sort of resistance to man-made poisons.
B、Insects have been eating plants for about 250 million years.
C、Farmers sometimes use a combination of two or three insecticides at once.
D、New insects mate with insects which survived from a certain kind of insecticide.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3189600.html
相关试题推荐
Scientistsfirst______theideaoftheatomicbombinthe1930s.A、perceivedB、c
Whatdoesitmeanbymentioning"oppositesidesoftheworld"?[originaltext]
Howmanystudentswereinthistestabouteconomics?[originaltext]Howmuch
HowmanyoverseasvisitorstraveledtoNewYorkcityin2007?[originaltext]
WhenRodLavergotbehind,hewould[br][originaltext]RodLaverwasaten
Thebesttitleforthisselectionis[br][originaltext]Doyouknowhowas
Thebesttitleforthisselectionis[br][originaltext]Doyouknowhowas
Whatisthedisadvantageofanexcursionfare?[br][originaltext]T:Goodmorni
Whatisthedisadvantageofanexcursionfare?[br][originaltext]T:Goodmorni
Whatisthedisadvantageofanexcursionfare?[originaltext]T:Goodmorning.Ca
随机试题
Increasingnumbersoffarmersaregrowinggeneticallyengineeredcrops.Ane
请阅读下列材料: “翻转课堂”将知识的学习安排在课前,知识的内化和拓展安排到课
为防止串联谐振过电压烧损电压互感器,倒闸操作时,不宜使用带断口()的断路器投
社会工作专业价值观受到()等意识形态的影响。A.人文主义 B.实用主义 C.
患者,女,27岁。发热,腹痛拒按,腹泻,大便赤白相间,里急后重,舌红苔黄腻,脉滑
商业银行通常对下列业务进行外包以转移操作风险,主要包括()。 A.资金交易
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
关于涉税信息报告事项代理服务的说法正确的有( )。A.税务师事务所及其涉税服务人
氧化反应中的强氧化剂具有很大的危险性,在受到高温、撞击、摩擦或与有机物、酸类接触
招标投标违法行为记录公告,绝对禁止公开涉及()的记录。A.国家秘密 B.个人
最新回复
(
0
)