It was in Beihai Park___they made a date for the first time____the old couple told us their love story.

A．that; that

B．where; when

C．that; when

D．where; that

含钙、镁、铁类金属离子的中药是（）

A.龙骨与牡蛎

B.石膏与瓦楞子

C.明矾与海螵蛸

D.石决明与赭石

E.龟甲与鳖甲