题目

听下面一段较长对话，回答以下小题。【1】Why does Frank come to the center?A.To visit a show. B.To hold an exhibition. C.To advertise his design.【2】Where did Frank grow up?A.In Liverpool. B.In Edinburgh. C.In Glasgow.【3】Why did Frank go to America?A.To go sightseeing. B.To get a degree. C.To find his interest.【4】Who inspired frank to make pots?A.His wife. B.His mother. C.His father-in-law.将0.2mol·L-1的KI溶液和0.05mol·L-1Fe2(SO4)3溶液等体积混合充分反应后，取混合液分别完成下列实验，能说明溶液中存在化学平衡2Fe3++2I－2Fe2++I2的是实验编号实验操作实验现象①滴入KSCN溶液溶液变红色②滴入AgNO3溶液有黄色沉淀生成③滴入K3[Fe(CN)6]溶液有蓝色沉淀生成④滴入淀粉溶液溶液变蓝色A. ①和③ B. ②和④ C. ③和④ D. ①和②