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
36
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
在电网络分析中,当复合支路含有电压控制电流源时,如果第k支路有一受第j支路元
通过一辆轮椅的走道净宽不宜小于:()A.1.1m B.1.2m C.1.
生石灰与()发生化学反应产生大量热,足以引燃燃点较低的材料。A.丙酮 B.
(2018年真题)托收结算方式可分为()。A.间接托收 B.直接托收 C.
共用题干 李先生,65岁,7年前曾患心肌炎,近2年逐渐出现体力活动后心悸、气急
开关柜红外测量时记录环境温度、负荷及其近()内的变化情况,以便分析参考。3小时
关于血流阻力的叙述,错误的是A.与血管的长度成正比 B.与血液的黏滞度成正比
指数预警法应用中,如果扩散指数大于0,表明风险正在上升。
第一逆反期的出现是()。 (A)儿童心理发展中的正常现象(B)由早期挫折造
对于采用资本金注入方式的政府投资工程,政府需要审批()。A.资金申请报告B.项目
最新回复
(
0
)