2. 外语
  3. The reason why birds don’t get lost on long flights ______. During daylight hours, birds ______.

The reason why birds don’t get lost on long flights ______. During daylight hours, birds ______.

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问题 The reason why birds don’t get lost on long flights ______.
During daylight hours, birds ______.
选项 A、fly aimlessly
B、rely on landmarks
C、use sun for guidance
D、are more likely to get lost
答案C
解析 见第二段首句：Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours．
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