In “My purpose is to help you feel less stressed .” “to help you feel less stressed” is used as        .

A．subject

B．predicative

C．object

D．attributive

肾盂结石1.2cm，IVP右肾功能正常，轻度积水，输尿管通畅，首选的治疗方法是（）。

A.中药排石

B.消炎止痛

C.手术取石

D.体外震波碎石

E.大量饮水