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
49
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
•ReadthefollowingreviewofabookcalledTheBossesSpeak.•Foreachquesti
[img]2016m11x/ct_ehbm_ehbreadf_0047_201610[/img][br]Oneofthemostinspiring
摩登舞起舞时位于A线的起端或B线的起端均为最佳位置。()
组织衰减可选择下列何项进行补偿A.边缘增强作用 B.时间增益补偿功能 C.显
岩质岸坡多出现在峡谷和丘陵水库,其破坏形式以()为主。A.涌浪 B.滑坡
杨先生今年45岁,打算60岁退休,考虑到通货膨胀,退休后每年生活费需要10万元,
对于基金收益分配的分红再投资方式,以下说法中错误的是()A.分红再投资是指将应
某市现有70万人口,如果五年后城镇人口增加4%,农村人口增加5.4%,则全市人口
根据支付结算法律制度的规定,付款人账户内资金不足的,银行应当为付款人垫付资金。
在我国,通过供精、供卵进行辅助生殖而获得后代不具有的权利和义务A、受教育权 B
最新回复
(
0
)