填方路基应事先找平，当地面坡度陡于()时，需修成台阶形式。
A.1：10
B.1：8
C.1：6
D.1：5
参考答案：D
SAS的粗分乘以（）取整数部分可得到标准分数。
A.1.25
B.1.55
C.1.75
D.2.15
— What do your parents do?
— They ______ doctors. [ ]
A. are all
B. are both
C. all are
D. both are
