人生来就有的基本面色，终生基本不变，称为（）
A.常色
B.主色
C.客色
D.善色
E.恶色
参考答案：B
The factory I visited yesterday was not the one _ I once worked. [ ]
A. which, where
B. which, which
C. where, where
D. where, which
坡度
