金瓷冠切端牙体磨除厚度一般为（）
A．1.5mm
B．1.0mm
C. 2.0mm
D．0.5mm
E．3.0mm
参考答案：C
They were standing so far away that I couldn’t_____ their faces clearly.
A．make out
B．make for
C．make off
D．make up
农产品质量安全例行监测由目前的（）个城市扩展到全国所有大中城市。
A.30
B.35
C.37
D.40
