2. 外语
  3. Birds don’t get lost on their migratory flights, and the reasons ______. Warblers’ ability to use stars as guidance ______.

Birds don’t get lost on their migratory flights, and the reasons ______. Warblers’ ability to use stars as guidance ______.

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问题 Birds don’t get lost on their migratory flights, and the reasons ______.
Warblers’ ability to use stars as guidance ______.
选项 A、is natural
B、will lose if they do not use it for too long
C、can’t recover even if they are set free from the life-long cage
D、can learn as they grow up
答案A
解析 本题询问鸣鸟利用星星指引方向的能力的情况。根据原文(37)处可知，鸣鸟利用星星指引方向的这种能力是天生的，故选A。
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