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
35
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、Because farmers use less insecticides now.
B、Because farmers have been using insecticides for many years.
C、Because insects axe 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
原文已经告诉了我们答案:“Now in- sects are using these same mechanisms to deal with man—made poisons—insecticides,This is why resistance of insects to insecticides has developed so rapidly.”
转载请注明原文地址:https://tihaiku.com/zcyy/3211556.html
相关试题推荐
[originaltext]W:Soundsgood.Thatkindofresponsibilitycanbeintimidatingi
[originaltext]W:Soundsgood.Thatkindofresponsibilitycanbeintimidatingi
[originaltext]W:Soundsgood.Thatkindofresponsibilitycanbeintimidatingi
[originaltext]W:Mr.Phelps.I’mMargaretSmith.Pleasesitdown.M:Thankyou.
[originaltext]W:Mr.Phelps.I’mMargaretSmith.Pleasesitdown.M:Thankyou.
[originaltext]W:Mr.Phelps.I’mMargaretSmith.Pleasesitdown.M:Thankyou.
[originaltext]M:So,now,youareoutwithyourlatestnovel.It’scalledQueen
[originaltext]M:I’mAviArditti,andthisweekonWordmaster.wehaveaspecia
[originaltext]M:I’mAviArditti,andthisweekonWordmaster.wehaveaspecia
[originaltext]M:I’mAviArditti,andthisweekonWordmaster.wehaveaspecia
随机试题
Ishouldbethe______mantothinkhighlyofthosewhowakeuptopersonsofinfl
[originaltext]M:Haveyoufoundthetroublewiththecar?W:Notyet.Theengin
[originaltext]W:Howoftendidyouphonehome?M:Iusedtophonehomeonceaw
[A]local[I]recalling[B]responsible[J]function[C]originally[K]excha
Sohard____hisstudythathefinallys
事故经过 某施工企业合伙人姜某安排施工负责人李某带领9名作业人员到设备基坑现场
铝酸盐水泥是否可与硅酸盐水泥混用? A.可以B.不可以C.在干燥条件下可以
图中甲、乙、丙、丁表示不同的气压带、风带。 图中丁风带的名称是()。A
A.絮凝 B.转相 C.酸败 D.合并 E.分层乳剂由O/W型转变为W/
(2012年真题)张明是一家著名高科技企业的人力资源总监,企业成立时他就负责人力
最新回复
(
0
)