祈使句表达安全规则：Don't... / Be careful — 英语选择题
题目
体育馆地面刚拖过，杰克正准备在上面跑；接着，他又要把球朝同学扔去。按顺序选出最合适的安全提醒。A. Be careful! / Don't run on the wet floor. B. Don't run on the wet floor. / Don't throw the ball at your friends. C. Don't throw the ball at your friends. / Be careful! D. Don't play football. / Don't run on the wet floor.