题目内容

Where did this conversation probably take place？（）

At a post office.
B. At a middle school.
C. In a restaurant.
D. In a hospital.

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In England, afternoon tea, taken between four and five, is the most (1) meal of the day. If you are a friend of the family, you may drop in for tea without an(2) or telling you are coming. Very often it is not (3) at a table. The members and (4) take tea in the sitting-room. Each person has a cup and saucer, a spoon and a small plate for bread-and-butter and cake. By the way, do not help yourself to cake first, bread-and-butter first, then cake if there is any. Another piece of (5) : do not put more than one piece of bread or cake at the same time. 4（）

银汞合金是历史悠久的充填修复的材料，具有强度高、可塑性好、操作方便、与牙体组织密合等优点，近年来还在不断改进，提高性能高铜银汞合金抗腐蚀性好，强度增加，原因是减少或基本消除了固化物中的

A. γ相
B. γ1相
C. γ2相
D. ε相
E. η相

根尖距上颌窦下壁最近的牙为

A. 上颌第一前磨牙
B．上颌第二前磨牙
C．上颌第一磨牙
D．上颌第二磨牙
E．上颌第三磨牙

逻辑型数据只占用【6】个字符。