最早萌出的乳牙为
A．下颌乳中切牙
B．上颌乳中切牙
C．上颌第一乳磨牙
D．上颌乳侧切牙
E．下颌第一乳磨牙
参考答案：A
Speaker A: Can I help you Speaker B:______
A．Sorry, I don't need your help.
B．What help can you give us
C．Thanks. It's very kind of you to offer us help.
D．I'd like to try on these shoes, please.
中金所国债期货最后交易日的交割结算价为（）
A.最后交易日最后一小时加权平均价
B.最后交易日前一日结算价
C.最后交易日收盘价
D.最后交易日全天加权平均价
