A:实验室用大理石和稀盐酸制取CO2: 2H+ + CO32- = CO2↑+ H2O
B:铁和稀盐酸反应: 2Fe + 6H+ =3H 2↑+ 2Fe 3+
C:稀硫酸与锌反应:H2SO4+Zn=Zn2+ +SO42-+H2↑
D:NaHCO3溶液与NaOH溶液反应: OH- + HCO3-= CO32-+ H2O
— Yes. She is ____ exchange student from America.