题目内容

随着人们对更方便的电话通讯的需求不断增长，移动电话应运而生。

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3/4冠邻沟的预备要求为

A. 方向与牙冠唇面切1/3平行
B. 深度1mm，由切端向龈端逐渐变浅
C. 两邻沟应相互平行，或稍向切端聚合
D. A+B
E. B+C

50（）

A. always
B. nor
C. also
D. still

Since his blood pressure is much higher than it should be, his doctor insists that he should not smoke.

49（）

A. floor
B. door
C. window
D. ceiling