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
2024-01-12
54
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/3357179.html
相关试题推荐
Aparticularrocketcarcantravelforsustainedperiodsatamaximumspeedof2
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Excessinventory,amassiveproblemformanybusinesses,hasseveralcauses,
Manyconsumersareconcernedabouttheecologicaleffectsofwastefulpackaging.
Proponentsoforganicfarmingclaimthatusingchemicalfertilizersandpesticid
Fromacertainfarmingregion,truckscancarryvegetablestomarketinNewMexi
Theblackholehasenteredthepopularimaginationasobjecttoomassivethatne
AlthoughsomeofficialsnotedthatusingmachinesforfarminginChinacostsmor
随机试题
Wildclaimsonlabelsofworthlessmedicinesaremuchlessfrequentthanthe
TheboyhasneverheardanyEnglishsongs(play)______ontheguitar.played分析句子可知,
Asisknowntoall,theorganizationandmanagementofwagesandsalariesare
Astronomersstudyingacertainkindofsupernova(explodingstar)weresurpr
Markrefusedtotakethejobbecause______.[br][originaltext]A:Doyouknowt
WhensomenineteenthcenturyNewYorkerssaid"Harlem”,theymeantalmostal
工程项目质量目标实现的最重要和最关键的过程是在施工阶段,包括(??)A.施工准
开关柜局部放电会产生(____)。声波$;$光波$;$电磁波$;$热量
2019年年初,乙公司为其200名中层以上职员每人授予100份现金股票增值权,这
根据税收征收管理法律制度的规定,下列情形中,税务机关有权责令纳税人提供纳税担保的
最新回复
(
0
)