_______(47)A. This allowed scientists to gauge th
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_______(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.
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答案：D
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。