小题1:Whose attitude(态度)  towards homework is positive(积极的) ?

A．William and Mary.

B．Chris and Sarah.

C．William and Sarah.

D．Mary and Chris.小题2: According to Mary's post, we know _______.

A．she likes homework a lot.

B．she thinks checking homework is worthless.

C．she hates students who don't do homework.

D．she hopes people can understand her hard work.小题3:Sarah is a_______.

A．parent

B．writer

C．student

D．teacher

男性，58岁，尿频、排尿困难3年，尿流中断半年，下腹X线平片及B超可见膀胱区2枚3.0cm×2.5cm×2.5cm和2.5cm×2.0cm×2．0cm结石，上尿路未见异常改变。

患者宜采用哪种治疗（）

A.膀胱内碎石术

B.饮用磁化水

C.膀胱切开取石

D.套石术

E.药物排石