2. 外语
  3. Pigeons have a natural instinct(天性) to go back home, even if they are very far away and the trip is hard or dangerous. Men use t

Pigeons have a natural instinct(天性) to go back home, even if they are very far away and the trip is hard or dangerous. Men use t

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问题     Pigeons have a natural instinct(天性) to go back home, even if they are very far away and the trip is hard or dangerous. Men use this homing instinct to send messages(传言) on small pieces of paper which are fixed to the pigeons’ backs or legs. In war time, pigeons have been known to fly 75 miles an hour and to run 500 or 600 miles. These homing pigeons begin their training(训练) when they are about four weeks old. After a few weeks they begin flying and carrying messages. If everything goes well, they can work about four years.  
Pigeons have a natural instinct for ______.
选项 A、going back home
B、growing fast
C、flying at a high speed
答案A
解析 文中提到它即使在很远的地方或旅途艰难而危险也能找回家。因此选项[A]“回家”是答案。
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