牙根相对较粗大者为（）。
A.上颌中切牙
B.上颌侧切牙
C.下颌中切牙
D.下颌侧切牙
E.上颌尖牙
参考答案：E
Why ____ a notebook with you? I've left it at home. [ ]
A. don't have
B. not having
C. not you have
D. don't you have
下列属于直接经济薪酬的是（）。
A.工资
B.股票分红
C.带薪休假
D.工作福利
