The reason why birds don’t get lost on long flight ______. Under man-made stars, the bird in the cage ______.

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问题 The reason why birds don’t get lost on long flight ______.
Under man-made stars, the bird in the cage ______.

选项 A、tried to fly in the opposite direction of birds not caged
B、changed direction when the position of the stars was changed
C、wouldn’t fly well
D、stayed where they were

答案B

解析
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