一般来说，QC小组计算经济效益的时间范围是（）
A.一年
B.小组注册周期
C.活动期（包括巩固期）
参考答案：C
There are eight foreign teachers in our school, five of________are young ladies.[ ]
A. them
B. whom
C. who
D. which
Tom usually goes fishing __ Sunday morning.
A. at B. on C. for
