预热空气发生炉在点火之前要进行（）。
A.打扫卫生
B.预热
C.检修
D.吹扫
参考答案：D
Her operation was a success, but it took her a long time to ___ from her illness.
A．suffer
B．return
C．recover
D．come
汇出外币汇票业务中，汇票经后台柜员止付后系统显示的状态为（）
A、ISSUED-N
B、SENT AND STOP
C、STOPED
D、SETTLED-N
