2. 外语
  3. Birds don’t get lost on their migratory flights, and the reasons ______. Which of the following can be used as the guidance for

Birds don’t get lost on their migratory flights, and the reasons ______. Which of the following can be used as the guidance for

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问题 Birds don’t get lost on their migratory flights, and the reasons ______.
Which of the following can be used as the guidance for warblers?
选项 A、Mountain ranges.
B、River courses.
C、Sun.
D、All of the above.
答案D
解析 本题询问可以被鸣鸟利用作向导的事物。根据原文(40)处可知，鸣鸟在白天飞行时靠太阳指引方向；当太阳被云遮住时，就靠山脉、海岸和河流来识别方向，故选D。
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