问题详情

All of the following are true according to the passage EXCEPT ______.
A．in the wartime trained message pigeons can fly 500 to 600 miles
B．hardships and dangers cannot block pigeon"s instinct to return home
C．racing horses are able to learn much faster than other horses
D．the message paper is carried usually under the wings of the pigeons请帮忙给出正确答案和分析，谢谢！