首页
登录
职称英语
What conclusion can be drawn from the scientists’ observation? [originaltext]
What conclusion can be drawn from the scientists’ observation? [originaltext]
游客
2023-11-15
74
管理
问题
What conclusion can be drawn from the scientists’ observation?
Scientists have discovered 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-madepoisons--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 attract 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、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 insects which survived from a certain kind of insecticide.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3189600.html
相关试题推荐
Scientistsfirst______theideaoftheatomicbombinthe1930s.A、perceivedB、c
Whatdoesitmeanbymentioning"oppositesidesoftheworld"?[originaltext]
Howmanystudentswereinthistestabouteconomics?[originaltext]Howmuch
HowmanyoverseasvisitorstraveledtoNewYorkcityin2007?[originaltext]
WhenRodLavergotbehind,hewould[br][originaltext]RodLaverwasaten
Thebesttitleforthisselectionis[br][originaltext]Doyouknowhowas
Thebesttitleforthisselectionis[br][originaltext]Doyouknowhowas
Whatisthedisadvantageofanexcursionfare?[br][originaltext]T:Goodmorni
Whatisthedisadvantageofanexcursionfare?[br][originaltext]T:Goodmorni
Whatisthedisadvantageofanexcursionfare?[originaltext]T:Goodmorning.Ca
随机试题
TheNationalDayofCanadaisA、July1st.B、July4th.C、January26th.D、June5th.
Sportisnotonlyphysicallychallenging,butitcanalsobementallychalle
影响袋式除尘器压力损失大小的因素中,下列哪一项是错误的?()A.除尘器设在风
A.π-2 B.π+2 C.π D.π+1
下列属于非标准化债权资产的有()。A.国债 B.承兑汇票 C.信托贷
患者,男性,40岁。进行性贫血,发热,骨痛。双腋下淋巴结如花生米大小,肝肋下1c
教师的心理健康问题主要表现为()和()。
在国外,征信机构更新个人信息的频率大致有()。A:实时更新B:次日更新C:次
A.赤芍 B.山豆根 C.白芷 D.板蓝根 E.细辛切面白色或灰白色,具
窝沟封闭成功的关键是()A.酸蚀剂量要大 B.酸蚀时间要充足 C.牙面要彻底
最新回复
(
0
)