around the fire, the tourists danced with the local people.                                                                                                                                                                                                 

A．Gather

B．To gather

C．Gathering

D．To be gathering

上前牙PFM全冠切端预备至少

A．1.5～2.0mm
B．0.35～0.5mm
C．0.8～1.5mm
D．1.8～2.0mm
E．2.0mm以上