A:S2-+H2OHS-+OH-
B:CO2+H2OHCO3-+H+
C:CH3COOH+H2OCH3COO-+H3O+
D:CO32-+2H2OH2CO3+2OH-
选不同项。
①____A.breakfast B.library C.dinner
②____A.thirty B.forty C.second
③____A.China B.London C.Sydney
④____A.jump B.run C.kid
⑤____A.chicken B.juice C.milk
—No, it's ____ (her).