小儿最早长出的乳牙一般是（）
A.上中切牙
B.下中切牙
C.上侧切牙
D.下侧切牙
E.第一乳磨牙
参考答案：B
—Could you please tell me what time it is now?
—Sorry, I _______ know. I _______ a watch. [ ]
A. don't, don't have
B. amn't; amn't
C. do; haven't
D. doesn't; doesn't
以下是PadsLayout的主工作界面的有（）。
A.工具栏
B.原点
C.状态栏
