家住上海的贝贝想利用暑假时间到祖国各地考察，他设计了两条旅游路线，如图，完成下列问题。
Nobody knew who was the first ________ at school that morning when the window was broken.
A．Cu＋2HCl＝CuCl2＋H2↑ B．Zn＋2HNO3＝Zn(NO3)2＋H2↑
C．2Fe＋3H2SO4＝Fe2(SO4)3＋3H2↑ D．SO2＋2NaOH＝Na2SO4＋H2O
E．Cu＋2AgCl＝CuCl2＋2Ag F．Cu(OH)2＋Na2CO3＝CuCO3↓＋2NaOH
G．2Fe＋3CuCl2＝2FeCl3＋3Cu H．Ba(NO3)2＋CuSO4＝Cu(NO3)2＋BaSO4↓
