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问题
单项选择题
下面所列楔状缺损的病因中应除去
A．刷牙
B．牙颈部的特殊结构
C．釉质发育不全
D．酸性龈沟液
E．牙体应力疲劳
答案
参考答案：
A
选择题
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—I'm playing games with my sister.
A. What does your sister do
B. Where is your sister doing
C. How about playing games
D. What are you doing now?
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问答题 简答题
简述恶心与呕吐的病因
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