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共用题干 Ants as a Barometer of Ecological

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问题 共用题干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 ant—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 recov-ery 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)_______(47)A: This allowed scientists to gauge the pace and progress of the ecological recovery.B: Yet in other businesses,such as farming 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 _______(47)
A: This allowed scientists to gauge the pace and progress of the ecological recovery.
B: Yet in other businesses,such as farming 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.
答案 D
解析 空前一句“Only certain species , for instance , will continue to thrive at a forest site that has been cleared of trees”讲到某些特定物种在被砍光树木的森林里还能够继续存活，空后一句“still others will move in and take up residence”讲到自然会有其他生物迁入并定居下来，F项“其他种类将会因为缺乏食物而灭绝”与上下文联系紧密，符合语境。
空后一句“scientists can determine how  ‘stressed ' the land is”讲到科学家们之所以利用蚂蚁是因为它们很常见而且种类繁多，在此之前应该说明怎么样利用蚂蚁,D项 “科学家们的观察是通过对蚂蚁的分类、数目的确定以及与前期调查结果的对比分析来进行的”符合语境。
空前一句讲到在一些矿井地带的recolonize（复原）过程中，会有一些蚂蚁的物种比其他物种更快地重新在植被破坏的土地上安家，A项“这样可以帮助科学家们测定生态恢复的速度和进程”与上文联系紧密，并且A项中的“the ecological recovery”与本段首句中的“are being restored”相照应，故选A。
空前一句“that governments worldwide accept their results when assessing the environ-mental impact of mining and tree harvesting”讲到世界各国政府都承认了通过蚂蚁而得出的关于估测采矿和伐林对环境带来的影响的结果，而第七段第一句则问道：为什么不用呢？B项“然而在另外一些行业中，比如农业和房地产开发业，用蚂蚁调查的方法并没有被广泛地采用”与下文联系紧密，起承上启下作用，符合语境。
空前一句“many companies can't afford the expense or the laboratory time needed to sift results for a comprehensive survey”讲到很多国家不能付出高额的费用，研究蚂蚁的专家稀少，故C项“雇佣他们花费巨大”与上文联系紧密，符合语境。
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