My ruler _________ longer than yours.[ ]
A. am
B. is
C. are
答案：B
牙尖部牙釉质最厚为( )
A．2～2.5mm
B．6mm
C．4～5mm
D．1mm
E．8mm
急性肝炎和亚急性肝炎早期明显增高的是
A．ALTB．ASTC．ALPD．AMYE．hCG
