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

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

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问题 The reason why birds don’t get lost on long flights ______.
The experiment with the dove implied that ______.
选项 A、birds should be taught to navigate
B、a dove 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 见第二段中句子“Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights．”。第三段中用dove做例子证明这句话。
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