The reason why birds don’t get lost on long flights ______. [br] During daylight

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问题 The reason why birds don’t get lost on long flights ______. [br] 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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