角化囊肿好发于
A．上颌前牙区B．上颌磨牙区C．上颌尖牙区D．下颌升支及磨牙区E．下颌前牙区
参考答案：D
—Putting on a happy face not only helps us make friends but also makes us feel better.
—__________.
A．I’d love to
B．I’m with you on that
C．It’s up to you
D．It’s my pleasure
关注食品安全十分重要，食用下列哪种食物容易引发食物中毒（ ）
A．发芽的马铃薯
B．在保质期内的袋装食品
C．不吃颜色鲜艳的蘑菇
D．剩饭剩菜蒸煮后再吃
