根据战略确定的中心不同可将总体战略划分为（）
A.保守型战略
B.低成本战略
C.差异化战略
D.风险型战略
E.重点战略
参考答案：B, C, E
There are two thousand students in our school, ______ are girls.[ ]
A. two-thirds in which
B. two-thirds in them
C. two-thirds of them
D. of whom two thirds
