某患者尿液有灰白色沉淀，加酸后沉淀物溶解并产生气泡，应考虑（）。

A.尿酸盐结晶

B.磷酸盐结晶

C.碳酸盐结晶

D.草酸盐结晶

E.磷酸钙结晶

--- What shall we have for dinner?

--- I bought ______ meat at _______ only market near our home.

A．an; a

B．the; /

C．a; the

D．/; the