单项选择题

义齿选磨调牙合时应选磨早接触的窝、斜面及边缘嵴和非支持尖，避免磨除支持件降低垂直距离。

A．对
B．错

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单项选择题

产后第一天子宫底的位置是在（）

A.脐上一指
B.脐上两指
C.平脐
D.脐下一指
E.脐下两指

多项选择题

How has Russian been surpassed by English in China in the twentieth century?
A、 Russian was the first foreign language from 1949 until the relationship with Russia deteriorated.
B、 Since the late 1950s, the first foreign language has been English.
C、 Even during those periods when English was officially classified as being the language of suspect forces, many educated and urban Chinese maintained a wish to learn it.
D、 English has always been the first foreign language since 1949.