Tom is tall, but his sisters, Mary and Kathy,       short.

A．are both

B．all are

C．are all

D．both are

长拳是一种伴有窜蹦跃跳和（）的拳术

A.闪展腾挪

B.起跃转折

C.步法稳固

D.跌扑滚翻