The policy will _______a chain reaction of automatic spending cuts that can lead to thousands of job losses.

A．set down

B．set off

C．set out

D．set about

选择人工前牙时不必考虑的因素

A．余留牙的颜色、形状和大小
B．患者过去是否戴过义齿
C．患者的面型
D．患者的肤色
E．患者的年龄