_______(49)A. This allowed scientists to gauge th
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_______(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.
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答案：B
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。