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【单选题】

The author is primarily concerned with describing ______.
A.research into tropical-forest biology on Barco Colorado Island

B.how the whole ecosystems can depend on the survival of a single species
C.the life cycle Of the fig wasp
D.the importance of forests to the human race
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根据网考网移动考试中心的统计,该试题:

27%的考友选择了A选项

72%的考友选择了B选项

0%的考友选择了C选项

1%的考友选择了D选项

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