在痛风急性发作期首选的药物是（）。

A.双氢克尿噻

B.秋水仙碱

C.丙磺舒

D.别嘌呤醇

E.消炎痛

It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.

A．that

B．what

C．which

D．where