Gun control is a subject () Americans have argued for a long time.

A．of which

B．with which

C．about which

D．into which

带下过少的临床表现可见（）

A. * * 干涩，甚则阴部萎缩

B.性欲低下，性交疼痛

C.烘热汗出

D.闭经

E.不孕