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【单选题】

The future ______ of the bald eagle is still an important American ecological concern.
A．birth

B．evolution
C．migration
D．survival
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

35%的考友选择了B选项

12%的考友选择了C选项

53%的考友选择了D选项

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