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、wheel back and forth
B、follow the stars in their flights
C、use sun for guidance
D、are quite likely to get lost

答案C

解析见第二段中句子“...experiments showed that birds rely on the sun to guide them during daylight hours”。

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成人本科学位英语

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

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