单选题 {{B}}第二节 短文理解2{{/B}}
阅读短文，从各题所给出的三个选项中选出可以填入空白处的最佳选项。
A

根据下面短文回答下列问题。
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.
单选题 Pigeons have a natural instinct for ______.
【正确答案】 A
【答案解析】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。
单选题 Men make use of the pigeons' instinct ______.
【正确答案】 C
【答案解析】文中提到利用鸽子来传递信息。所以[C]为答案。
单选题 Pigeons can be messengers (信使) for about ______.
【正确答案】 C
【答案解析】文中提到如果一切正常，鸽子们大概能工作四年。因此[C]为答案。
单选题 Pigeons having worked in war can fly ______ an hour.
【正确答案】 A
【答案解析】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]。