The river______ are covered with trees is polluted.

A．of which the banks

B．whose banks

C．the banks of which

D．A,B,C are right

（）气质类型的人精力旺盛、脾气急躁、容易冲动、心情变换剧烈。

A.多血质

B.胆汁质

C.黏液质

D.抑郁质