首页
登录
职称英语
Bracken, a poisonous weed, is spreading and damaging much pastureland in the Nor
Bracken, a poisonous weed, is spreading and damaging much pastureland in the Nor
游客
2024-01-13
28
管理
问题
Bracken, a poisonous weed, is spreading and damaging much pastureland in the Northern Hemisphere. One potentially inexpensive and self-sustaining countermeasure is to introduce natural enemies of the plant; therefore, some scientists have proposed to control bracken by a release of bracken-eating moths native to the Southern Hemisphere into bracken-infested areas in the Northern Hemisphere. If the scientists’ proposal for controlling bracken is adopted, which of the following is a necessary condition for its success?
选项
A、That bracken in the Northern Hemisphere grows in approximately the same climates and soil conditions in which it grows in the Southern Hemisphere.
B、That the released moths will feed on weeds other than bracken that are native to the Northern Hemisphere.
C、That the livestock that will return to pastures now lost to bracken will develop immunities to the diseases caused by bracken.
D、That the released moths will survive in sufficient numbers to build a population large enough to reduce bracken and retard its growth.
E、That traditional methods of control, such as burning, cutting, and chemical spraying, will not become less expensive or labor-intensive than they are now.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3358735.html
相关试题推荐
Heatesomepoisonousmushroomswithserious______.A、resultsB、impactsC、outcome
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytob
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytob
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytob
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytob
【T1】Fathersexposedtopoisonoussubstancesareprobablyjustaslikelytob
Bracken,apoisonousweed,isspreadinganddamagingmuchpasturelandintheNor
BUMPER:DAMAGING::A、ballast:founderingB、scale:comparingC、buoy:navigatingD、dr
BUMPER:DAMAGING::A、ballast:founderingB、scale:comparingC、buoy:navigating
Unfortunately,hisdamagingattacksontheramificationsoftheeconomicpolicy
随机试题
最初originally;attheverybeginning
[audioFiles]audio_eusm_j53_001(20082)[/audioFiles]A、Theyhavetobargainonthe
[originaltext]W:Whatisit,Bob?Yousoundedprettyseriousonthephone.Have
双代号网络图中,()表示工作,可以是作为成本计算对象的单位工程,如路基工程
《特种设备安全法》对特种设备的生产、经营、使用以及检验检测和监督管理作了详细的规
某点的应力状态如图所示,则过该点垂直于纸面的任意截面均为主平面。如何判断此结论?
消费者头脑冷静,行为慎重,在购买过程中,总是要做认真分析和比较,然后决定是否购买
试回答以下关于机械振动与冲击试验的问题。(2)振动台按其工作原理可以分为()。
题目:《导线切割磁感线时的感应电动势》 内容 3.基本要求: (
2013年3月,人身险的三个险种保费收入环比增速排序正确的是:A.人身意
最新回复
(
0
)