首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Ants as a Barometer of Ecological Change At picnics, ants are pests. But they have their uses. In industries such as mining, far
Ants as a Barometer of Ecological Change At picnics, ants are pests. But they have their uses. In industries such as mining, far
admin
2009-06-15
42
问题
Ants as a Barometer of Ecological Change
At picnics, ants are pests. But they have their uses. In industries such as mining, farming and forestry, they can help gauge the health of the environment by just crawling around and being antsy.
It has been recognized for decades that ants--which are highly sensitive to ecological change--can provide a near-perfect barometer of the state of an ecosystem. Only certain species, for instance, will continue to thrive at a forest site that has been cleared of trees.
(46)And still others will move in and take up residence.
By looking at which species populate a deforested area, scientists can determine how "stressed" the land is.(47)Ants are used simply because they are so common and comprise so many species.
Where mine sites are being restored, for example, some ant species will recolonize the stripped land more quickly than others.(48)Australian mining company Capricorn Coal Management has been successfully using ant surveys for years to determine the rate of recovery of land that it is replanting near its German Creek mine in Queensland,
Ant surveys also have been used with mine-site recovery projects in Africa and Brazil, where warm climates encourage dense and diverse ant populations. "We found it worked extremely well there," says Jonathan Majer, a professor of environmental biology. Yet the surveys are perfectly suited to climates throughout Asia, he says, because ants are so common throughout the region. As Majer puts it: "That’s the great thing about ants."
Ant surveys are so highly-regarded as ecological indicators that governments worldwide accept their results when assessing the environmental impact of mining and tree harvesting.
(49)
Why not? Because many companies can’t afford the expense or the laboratory time needed to sift results for a comprehensive survey. The cost stems, also, from the scarcity of ant specialists.
(50)
A This allowed scientists to gauge the pace and progress of the ecological recovery.
B Yet in other businesses, such as fanning and property development, ant surveys aren’t used widely.
C Employing those people are expensive.
D They do this by sorting the ants, counting their numbers and comparing the results with those of earlier surveys.
E The evolution of ant species may have a strong impact on our ecosystem.
F Others will die out for lack of food.
选项
答案
F
解析
“空1”前面的句子有certain species,后面的句子有still others,这一定是英语中的“some/certain—others—still others”的固定结构。仅从这一点判断,F是答案。
转载请注明原文地址:https://kaotiyun.com/show/BGGd777K
本试题收录于:
职称英语综合类基础题库职称英语分类
0
职称英语综合类基础
职称英语
相关试题推荐
ChangesinMuseumsMuseumshavechanged.Theyarenolongerplacesthatone“should”visit,theyareplacestoenjoyandl
AlaskaIn1868AmericanswelcomedAlaskaintotheUnionasthe49thstate,symbolizingachangeofattitudefromthatheldi
StandardEnglishStandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtin
StandardEnglishStandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtin
TelevisionIsDoingIrrearableHarm“Yes,butwhatdidweusetodobeforetherewastelevision?”Howoftenwehearstateme
WhichofthefollowingisNOTtrueoftheJapanese?WhichofthefollowingisNOTtrueofBritain?
CarefulobservationsandsystematicstudiesofsunspotsTheleadingspotandthefollowingspotarethenamesof
ParentsintheUnitedStatestendtoasktheirchildrenWhichofthefollowingisNOTtrueofworkingclassAmericans?
WhathappenedtoEarhart?Whichofthefollowingstatementsistrue?
YourmoneywillearnmoremoneyifyouputitTheword"touch"inparagraph7couldbebestreplacedby
随机试题
教育目的对整个教育工作起()作用。
A.超急性期心肌梗死B.急性期心肌梗死C.近期心肌梗死D.陈旧性心肌梗死ST段斜形抬高、T波高大、无异常Q波提示
关于横向磁化矢量的描述,错误的是
患者,女,25岁。痛经2年,经行不畅,小腹胀痛拒按,经色紫红,夹有瘀块,血块下后痛可缓解,舌有瘀斑,脉沉涩。治疗应以哪组经脉腧穴为主
一级建筑位移观测的基准点不应少于()个。
凡申请出境居住( )的中国籍人员,必须持有卫生检疫机关签发的健康证明。
我国目前消费税的税目有()。
物业管理绩效评价的基本要素有()
缺货成本是指企业适时适地的持有所需零部件或物料时所发生的成本。()
测试程序使用的数据应
最新回复
(
0
)