All don't have a free ticket must pay the admission fee.

A．Everyone who doesn't have a free ticket

B．No one who doesn't have a free ticket

C．No one who has free tickets

D．Anyone who has free tickets

口蹄疫的临床特点为口腔黏膜、蹄部和 * * 皮肤发生（）和烂斑

A.水疱

B.水肿

C.炎症

D.坏死