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
2023-11-23
11
管理
问题
What conclusion can be drawn from the scientists’ observation? [br]
Scientists have discovered that plants themselves pro- duce 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--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 at-tract 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、Farmers should use less insecticides.
B、Farmers should use a combination of two or three insecticides at once.
C、At certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect.
D、Farmers should regularly spray crops as a precaution against problems that are caused by large numbers of pests.
答案
D
解析
“They should,instead,spray only where pests have actually been seen.”,“Secondly,farmers could use a combination of two or three insecticides at once.”,“farmers should actually try to attract insects onto the crops they are trying to protect”选项A,B,C在课文中都有提
转载请注明原文地址:https://tihaiku.com/zcyy/3211557.html
相关试题推荐
[originaltext]M:Canwearingsunglassesmakeyoumorevulnerabletosunburn?A
[originaltext]M:Canwearingsunglassesmakeyoumorevulnerabletosunburn?A
[originaltext]M:Mm…Ithinkweseeeyetoeyethere.Howaboutthoselanguages
[originaltext]M:Mm…Ithinkweseeeyetoeyethere.Howaboutthoselanguages
[originaltext]M:Mm…Ithinkweseeeyetoeyethere.Howaboutthoselanguages
[originaltext]M:MissEllenChan?Goodtoseeyou.Thankyouforcoininginto
[originaltext]M:MissEllenChan?Goodtoseeyou.Thankyouforcoininginto
[originaltext]M:MissEllenChan?Goodtoseeyou.Thankyouforcoininginto
[originaltext]M:Alright,sotalktomeaboutdifferentagegroupsandhowmuch
[originaltext]M:RuthPetersisachildpsychologist,hey,Ruth,goodmorning.
随机试题
Bloggingisapastimeformany,evenalivelihoodforafew.Forsome,itbe
[originaltext]Cottonvilleisanewprisonspeciallydesignedforwomencrim
IntheMiddleAgesstudents______.[br]Itmaybeconcludedthattesting______
[originaltext]M:Youmightfindworkatthedepartmentstore.Theyalwaysneed
下列关于居住区内地面水排水方式的选择,何者错误?()A.在山区和丘陵地区必须
急性前壁心梗后第6天,于胸骨左缘出现响亮的收缩期杂音伴震颤,应考虑AMI合并了(
患者小王,女,23岁,在得知自己被确诊为白血病时,忍不住失声痛哭。这时护士小李走
国家实行教师资格、职务、聘任制度,通过考核、奖励、(),提高教师素质,加强教
下列导致法律责任的情况包括()。 A.塑胶五金厂要求工人一天至少工作15个小时
最新回复
(
0
)