2. 外语
  3. The reason why birds don’t get lost on long flights ______. The experiment with the dove indicated that ______.

The reason why birds don’t get lost on long flights ______. The experiment with the dove indicated that ______.

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问题 The reason why birds don’t get lost on long flights ______.
The experiment with the dove indicated that ______.
选项 A、birds have to be taught to navigate
B、a bird that has been caged will not fly long distances
C、some birds cannot fly at night
D、some birds seem to follow the stars when they fly at night
答案D
解析 见第三段：Yet it showed an inborn ability to use the stars for guidance．其余三项无根据。
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