三家分晋中，被灭的四卿之一是（）
A、韩氏
B、赵氏
C、智氏
D、晋氏
参考答案：C
Why don't you bring ________ to his attention that you are too busy to go skating with him?[ ]
A. one
B. that
C. it
D. yourself
与无放回抽样相比，放回抽样更为常用
