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 having worked in war can fly ______ an hour.
选项 A、over 75 miles
B、about 7 to 8 hours
C、over 600 miles
答案A
解析 文中提到战争时期，据说鸽子一小时飞行了75英里，一次走过500或600英里。所以答案为A
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