根据形成阻碍和解除阻碍的方式不同将普通话声母分为五类，z，c，zh，ch，j，q属于（）
A.塞音
B.擦音
C.塞擦音
D.边音
参考答案：C
The man ______ was a friend of mine．
A．you just talked to
B．whom you just talked to him
C．who you just talked to him
D．which you just talked to
已知山区某建设项目废气中SO2的等标排放量是3.0×109，则该项目大气的评价等级为( )。
A．一级
B．二级
C．三级
D．四级
