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
16
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、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 insecticide-surviving insects.
答案
A
解析
昆虫通过进化可以抵制植物本身的抗虫物质一一有毒化学物质poisonous chemicals,昆虫也可以通过相同的方式对付人工杀虫剂man-made poisons—insecticides。这就是昆虫的抗杀虫剂性迅速增强的原因。可见科学家发现了昆虫的抗杀虫剂性。故正确答案为A。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2999547.html
相关试题推荐
[originaltext]M:HowdidSallygowithherpresentationlastnight?W:Nosoone
[originaltext]M:HowdidSallygowithherpresentationlastnight?W:Nosoone
[originaltext]Sciencefictionwritershaveoftenimaginedhumanbeingsgoin
[originaltext]Sciencefictionwritershaveoftenimaginedhumanbeingsgoin
[originaltext]It’sgenerallyagreedthatserious,violentcrimehasreached
[originaltext]M:Excuseme,areyouwaitingtobuyconcerttickets?W:Yes,Ia
[originaltext]M:Excuseme,areyouwaitingtobuyconcerttickets?W:Yes,Ia
[originaltext]M:Excuseme,areyouwaitingtobuyconcerttickets?W:Yes,Ia
[originaltext]M:Excuseme,areyouwaitingtobuyconcerttickets?W:Yes,Ia
[originaltext]M:Hey,Sally!Areyougoingtostayinthatbathroomfortheres
随机试题
【B1】[br]【B13】A、authoritiesB、authorshipC、authorD、scholarsA本题考查词义。authoritie
Youwillnowbeaskedtogiveyouropinionaboutafamiliartopic.Afteryouhea
Dearsir,ThankyouforyourletteronMarch15.Weknowthatyouwanttoor
如果有两个事务,同时对数据库中同一数据进行操作,不会引起冲突的操作是A.其中有一
基于BIM技术,重点从()等方面进行施工节材与材料资源利用控制。A.钢材 B.
唾液的主要成分中不包括A.黏液 B.白蛋白 C.唾液淀粉酶、麦芽糖酶 D.
2021年1季度批发和零售业增加值的同比增量约是租赁和商务服务业的多少倍
某逻辑问题的真值表如表所示,由此可以得到,该逻辑问题的输入输出之间的关系为:
“细雨成阴近夕阳,湖边飞阁照寒塘。黄花应笑关山客,每岁登髙在异乡。”这首诗中包含
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
最新回复
(
0
)