There was something wrong with the line. We couldn't ______ each other clearly.
A:listen
B:sound
C:hear
D:speak
(Ⅰ)当实数m取什么值时,复数z是纯虚数;
(Ⅱ)当m=0时,化简 z2z+5+2i .
欧洲宗教改革中,不代表资产阶级利益的教派是( )