2. 外语
  3. The future ______ of the bald eagle is still an important American ecological concern.

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

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问题 The future ______ of the bald eagle is still an important American ecological concern.
选项 A、birth
B、evolution
C、migration
D、survival
答案D
解析 句意：秃鹫的长远生存仍然是美国一项重要的生态忧虑。survival生存，幸存。 birth出生。evolution进化，演化。migration迁移，移居。
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