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问题 单项选择题

Begg矫治器带环颊面管的长度为（）

A.5.9mm

B.5mm

C.6.3mm

D.7.0mm

E.7.5mm

答案

参考答案：C

补全对话，情景问答
给下列的问句选择合适的答语。
( ) 1. Hi, I'm Zip. What's your name?
( ) 2. Mom, this is Wu Yifan.
( ) 3. How are you?
( ) 4. Let's go to school!
( ) 5. Good afternoon, Miss White!		A. Nice to meet you.
B. I'm fine, thank you. And you?
C. Great!
D. Good afternoon!
E. My name is Zoom.
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单项选择题

西周婚姻实际上实行的是：( )

A．一夫多妻制

B．一夫一妻一妾制

C．早期是一妻多夫制

D．一夫一妻制
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