乳牙患龋高峰的年龄是几岁()
A．1～2
B．2～4
C．7～8
D．10～12
E．12～14
参考答案：C
—Amy, please tell the people seated and ________ for their turns to come to my office five minutes later.
—Yes, sir.
A．wait
B．waiting
C．waited
D．to wait
生吃蔬菜水果时要注意什么？
