期货交易所向会员收取的保证金，不得（）国务院期货监督管理机构、期货交易所规定的标准。
A.等于
B.低于
C.高于
D.高于或等于
参考答案：B
有6个座位连成一排，现有3人就坐，则恰有两个空座位相邻的不同坐法有( )
A．36种
B．48种
C．72种
D．96种
Short hair is back ________ this year.The female workers in my office all had their long hair cut.[ ]
A. in common
B. in style
C. in trouble
D. in place
