首页
登录
职称英语
[originaltext] Scientists have observed that plants themselves produce many
[originaltext] Scientists have observed that plants themselves produce many
游客
2024-05-09
16
管理
问题
Scientists have observed that plants themselves produce many poisonous chemicals for defence 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-made poisons--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 poisons 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.
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 our poisons invade our farms and eat our crops.
选项
A、Insects would be out of control some day if nothing were done about the present situation.
B、Insects will some day eat all green vegetables on earth.
C、Insects are the most adaptable creatures.
D、Insects have developed resistance to both botanical and artificial poisons rapidly.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3591498.html
相关试题推荐
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]Stateswithahighlyeducatedpopulaceandhighertaxesoncigare
[originaltext]Stateswithahighlyeducatedpopulaceandhighertaxesoncigare
[originaltext]W:Soyoureallybelievethatclothescarryakindofmessagefor
[originaltext]M:Loisand1wanttohavedinnertogetherafterclassnextFrida
[originaltext]M:Loisand1wanttohavedinnertogetherafterclassnextFrida
[originaltext]M:Loisand1wanttohavedinnertogetherafterclassnextFrida
[originaltext]M:Loisand1wanttohavedinnertogetherafterclassnextFrida
[originaltext]M:Loisand1wanttohavedinnertogetherafterclassnextFrida
随机试题
Originally,USgeneralelectionswereheldinearlierNovemberbecause______.[b
A.acceptB.unquantafiableC.useD.whatE.
Negotiationsworkwonders.Thisisparticularlysoininternationalbusiness
CreateaConservation-OrientedCampus1.建设节约型校园十分重要2.原因是…3.为了建设节约型校园我们应该…
[originaltext]W:Hello.ThisisSummerHotel.MayIhelpyou?M:Yes,I’dlike
下列属于BIM技术特点的是()。A.不可出图性 B.协调性 C.参数化
A.血常规 B.血培养 C.病毒分离 D.特异性抗体检测 E.影像学检查
赵某,男,56岁。反复脘闷2年,脘腹痞闷,嘈杂,饥不欲食,恶心嗳气,口燥咽干,大
建筑物的局部剖面图,如图所示。室外地坪填土是在结构封顶以后进行的,在下列计算中,
2012年开展某燃煤电厂项目环评,大气影响环境评价工作等级为二级。关于大气影响预
最新回复
(
0
)