2. 外语
  3. The reason why birds don’t get lost on long flight ______. Experiments showed that ______.

The reason why birds don’t get lost on long flight ______. Experiments showed that ______.

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问题 The reason why birds don’t get lost on long flight ______.
Experiments showed that ______.
选项 A、birds are likely to get lost if there aren’t man-made stars.
B、day-flying birds depend on the sun while night-flying birds depend on the stars
C、birds depend on the sun to guide them
D、birds depend on the stars to guide them
答案B
解析
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