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问题 单项选择题

当口腔处于休息状态下，上颌全口义齿易松动脱落，最常见的原因是（）。

A.基托后缘封闭不好

B.没有牙平衡

C.颊侧边缘伸展过长

D.人工牙排列偏腭侧

E.有组织倒凹

答案

参考答案：A

选择题

-Your sister nearly ________ all her spare time to her study during the three years.

-That's right，or she ________ first place in her school in the College Entrance Examination.[ ]

A．devoted; wouldn't have taken

B．spent; wouldn't have taken

C．hadn't devoted; hadn't taken

D．hadn't spent; couldn't take
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单项选择题

Win2000的版本总共有几种（）。

A.1

B.2

C.3

D.4
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