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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（测定）the health of the environment by just crawling around and  being antsy（坐立不安）.
It has been recognized for decades that ants—which are highly sensitive to ecological change—can provide a near-perfect barometer（气压计）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（构成）so many species.
Where mine sites are being restored,for example,some ant species will recolonize（重新移居到.……）the stripped land more quickly than others.______ (48 ) Australian mining compa- ny 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 Major,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 Major puts it:“That's the great thing about ants.”
Ant surveys are so highly regarded as ecological indicators（指示器）that governments world-wide accept their results when assessing（评估）the environmental impact of mining and tree har- vesting.______(49）.
Why not?Because many companies can't afford the expense or the laboratory time needed to sift（详审）results for a comprehensive survey. The cost stems,also, from the scarcity（缺乏）of ant specialists.______(50)______(49)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 ______(49)
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 B
解析 空格46前面的句子中有certain species，后面的句子中有still others，这很可能是英语中的“some/certain-others-still others”的固定结构。另外，从上下文关系上看，空格46前面的句子以only作引导词，就排除了其他种类的生物在那样的条件下生存发展的可能性，这也就是选项F所表述的情况，故选F。
空格47后面的句子说“之所以使用蚂蚁，是因为……”，但是我们不清楚为什么要使用蚂蚁，选项中只有D说明了使用蚂蚁作研究的过程，而且选项D中出现一个代词 this，按照文章逻辑关系，this指代空格47前面的句子，因此，把D项填入空格中，意思通畅。故选D。
选项A中的ecological recovery与前面句子中的recolonize相呼应，也与下句中的recovery相呼应，这表明选项A是承上启下的过渡句，故选A。
选项B中的关键词other businesses , farming, property提示，选项B的句子是前面句子的后续句，因为前面句子中有mining , tree harvesting，也是businesses．用蚂蚁来分析的方法已被mining , tree harvesting这些行业广泛接受，但在farming和property等行业中的应用还不昔遍。故选B。
因为蚂蚁专家人才奇缺，所以雇用他们就会很贵。此外，those指的是前一句的，specialists，故选C。
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