决定牙弓形态的因素为（）
A.生长型
B.错类型
C.面型
D.后牙功能关系
E.遗传因素与环境因素共同决定
参考答案：E
——Is she a hard-working student?
——Yes, she is. She studies ______. She is also good at PE. She runs very______.
A．hardly; fastly
B．hard; fast
C．hardly; fast
D．hard; fastly
支付结算
