癃闭脾气不升证，治疗宜首选（）
A.补中益气汤
B.八正散
C.清肺饮
D.补中益气汤合春泽汤
E.六磨汤
参考答案：D
Quite a few people were injured or killed in this traffic accident last week, ________?
A．were they
B．did they
C．weren’t they
D．didn’t they
自然数a，b，c，d互不相等，已知a•b•c•d=2013，那么a+b+c+d=______．
