首页
登录
职称英语
The sustained massive use of pesticides in farming has two effects that are espe
The sustained massive use of pesticides in farming has two effects that are espe
游客
2025-02-25
18
管理
问题
The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the pests’ natural enemies in the area. Second, it often unintentionally gives rise to insecticide-resistant pests, since those insects that survive a particular insecticide will be the ones most resistant to it, and they are the ones left to breed.
From the passage above, it can be properly inferred that the effectiveness of the sustained massive use of pesticides can be extended by doing which of the following, assuming that each is a realistic possibility?
选项
A、Using only chemically stable insecticides
B、Periodically switching the type of insecticide used
C、Gradually increasing the quantities of pesticides used
D、Leaving a few fields fallow every year
E、Breeding higher-yielding varieties of crop plants
答案
B
解析
Evaluation of a Plan
Situation Continued high-level pesticide use often kills off the targeted pests’ natural enemies. In addition, the pests that survive the application of the pesticide may become resistant to it, and these pesticide-resistant pests will continue breeding.
Reasoning What can be done to prolong the effectiveness of pesticide use? It can be inferred that the ongoing use of a particular pesticide will not continue to be effective against the future generations of pests with an inherent resistance to that pesticide. What would be effective against these future generations? If farmers periodically change the particular pesticide they use, then pests resistant to one kind of pesticide might be killed by another. This would continue, with pests being killed of in cycles as the pesticides are changed. It is also possible that this rotation might allow some of the pests’ natural enemies to survive, at least until the next cycle.
A Not enough information about chemically stable insecticides is given to make a sound inference.
B Correct. This statement properly identifies an action that could extend the effectiveness of pesticide use.
C Gradually increasing the amount of the pesticides being used will not help the situation since the pests are already resistant to it.
D Continued use of pesticides is assumed as part of the argument. Since pesticides would be unnecessary ror fallow fields, this suggestion is irrelevant.
E Breeding higher-yielding varieties of crops does nothing to extend the effectiveness of the use of pesticides.
The correct answer is B.
转载请注明原文地址:https://tihaiku.com/zcyy/3971741.html
相关试题推荐
StatisticiansstudyingthehealtheffectsofuraniumminingonNavajocommunitie
Themostcompellingevidenceoftherisksofcarcinogeniceffectsof
Thepresenteconomyremainsdependentonamassiveinwardflowof
Thepresenteconomyremainsdependentonamassiveinwardflowof
Thepresenteconomyremainsdependentonamassiveinwardflowof
Thepresenteconomyremainsdependentonamassiveinwardflowof
Themassiveinfluxofwomencyclists—makingupatleastathirdofthetotalmar
Themassiveinfluxofwomencyclists—makingupatleastathirdofthetotalmar
FarminghadbeenprofitableontheGreatPlainsformanydecades,butby1938(i
Thecrudeanimatedeffects(i)______projectedimagesfromseventeenth-centuryla
随机试题
Whenpeoplehavenowilltolive,peopleareoftenverydifficulttohelp.A、you
Thestorytookplace(发生)exactly______.[br]Thegirlwantedtoborrowapen,
Timeis,fortheaverageAmerican,ofutmostimportance.Tothe【B1】______vis
支付宝(Alipay)是中国最大的第三方在线支付平台,由阿里巴巴集团(AlibabaGroup)于2004年创建。截至2012年底,支付宝拥有用户超过
(2020年真题)关于在产品评估的说法,正确的有( )。A.采用成本法评估时,
净制枇杷叶的方法是A.刷去毛B.烫去毛C.燎去毛D.挖去毛E.撞去毛
根据现行宪法的规定,下列领导人中连续任职不得超过两届的有( ) A.国务委员
一般资料:求助者,女,46岁,职员。 案例介绍:求助者的儿子在市重点中学读书,
嫉妒情绪的特点包括()。 (A)总是针对具体的个体或群体(B)一旦发生
穿琥宁注射液使用注意事项有A.用药监护 B.适应范围 C.查过敏史 D.不
最新回复
(
0
)