Miss Read is good ____________ music. She is good ____________ children in the music club.
A:at, at
B:with, with
C:at, with
D:with; at
若复数z=(m-i)2是纯虚数,则实数m为 ( )
____ - ____=10
有俄罗斯学者认为,中国20世纪80年代的改革属于新版的苏俄新经济政策。这一认识的依据是两者都( )
如图,△ABC,用尺规作图作角平分线CD.(保留作图痕迹,不要求写作法)