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
2024-02-02
38
管理
问题
Scientists have observed 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-made poisons—insecticide. This is why resistance of insects to insecticide has developed so rapidly. What should be done? Scientists studying the problem suggest that farmers use less insecticide. 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 insecticide 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 devour our crops.
19 What does the speaker say about plants?
20 What is mentioned as one of the suggestions raised by scientists?
21 What is the most surprising suggestion scientists give?
选项
A、Using less insecticide.
B、Giving the plants up.
C、Spraying crops frequently.
D、Trying other insecticide.
答案
A
解析
短文提到了科学家给农场主的三点建议:少用杀虫剂、同时使用两种或三种杀虫剂、吸引别的昆虫到田间。A正是短文中提及的建议之一,故为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3416168.html
相关试题推荐
[originaltext]M:Didyoureallygiveawayallyourfurniturewhenyoumovedint
[originaltext]M:Didyoureallygiveawayallyourfurniturewhenyoumovedint
[originaltext]M:Didyoureallygiveawayallyourfurniturewhenyoumovedint
[originaltext]M:Didyoureallygiveawayallyourfurniturewhenyoumovedint
[originaltext]M:IjustreceivedanE-mailfromoneofmyformerclassmates.I
[originaltext]M:IjustreceivedanE-mailfromoneofmyformerclassmates.I
[originaltext]M:IjustreceivedanE-mailfromoneofmyformerclassmates.I
[originaltext]CountyfairsareatraditioninNewEnglandtowns.Theyoffer
[originaltext]CountyfairsareatraditioninNewEnglandtowns.Theyoffer
[originaltext]CountyfairsareatraditioninNewEnglandtowns.Theyoffer
随机试题
Clearlyifwearetoparticipateinthesocietyinwhichwelivewemust
[originaltext]Itistruethatgoodwritersrewriteandrewriteandthenrew
男,45岁,患主动脉瓣关闭不全。在主动脉瓣听诊区及主动脉瓣第2听诊区可闻及叹气样
下列属于宏观经济分析中数据资料来源的有( )。 Ⅰ.《中国统计年鉴》 Ⅱ.
不承担药品生产、行业管理组织职责的政府部门是A.卫生与计划生育委员会B.国家发展
在我国近代教育史上,以日本学制为蓝本,以“中学为体,西学为用”为指导思想制定并实
党委领导下的专门机关与广大群众相结合,是我国所有公安业务工作都必须遵循的共同指导
微软的Excel软件目前已经广泛应用于()领域。A:会计B:统计C:金融D
男,80岁。半个月前出现头痛、间断呕吐,并逐渐出现左侧肢体无力。3个月前有头部外
某独立土方工程,招标文件中估计工程量为200万m3,合同中规定:土方工程单价为5
最新回复
(
0
)