可与氨制硝酸银试剂反应生成银沉淀的药物是
A．雌二醇
B．甲睾酮
C．倍他米松
D．黄体酮
E．苯丙酸诺龙
参考答案：C
—How about visiting the museum?
—Good idea. But first we should find out ______ it is open. [ ]
A. how
B. whether
C. what
D. which
教学艺术
