Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.

A．rules

B．changes

C．demands

D．leagues

伸直型桡骨下端骨折可见畸形为（）

A.餐叉样

B.枪上刺刀状

C.锅铲状

D.靴状

E.锤状指样