患者男性，33岁，残冠，根尖病变。拔除过程中，远中颊根折断，取

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问题单项选择题

患者男性，33岁，残冠，根尖病变。拔除过程中，远中颊根折断，取根时，牙根突然消失。捏鼻鼓气时拔牙窝内有气体溢出

如X线片显示患者为低位上颌窦，移位的牙根已进入上颌窦，但仍位于拔牙窝附近，此时最佳处理方法（）

A．刮匙搔刮取根

B．观察

C．从穿孔处冲洗吸出断根

D．上颌窦根治术

E．于穿孔处开窗取根

答案

参考答案：E

填空题

用括号内所给动词的正确形式填空。

1. —I phoned you yesterday morning, but you were not in.

—We _______(fish) by the river.

2. _______(make) sure that there are no mistakes, he will check the paper carefully.

3. Is the washing machine I have used for a long time worth _______(fix)?

4. There _______(not be) much snow here in the past three years.

5. I don't know if we _______(show) around the History Museum tomorrow afternoon.

单项选择题

司机到站停车时，应选择路况较好的地点停车，车辆停稳后发鸣笛（），乘人员方可下车。

A.一声

B.两声

C.三声

D.四声