A：氢氧化钠溶液吸收过量的二氧化碳OH－＋CO2 ＝ HCO3－
B：亚硫酸氢铵溶液与足量氨水反应HSO3－＋ OH－＝ SO32－＋ H2O
C：氯气通入冷水中 Cl2 ＋H2O ＝ Cl－＋ClO－＋2H+
D：碳酸镁悬浊液中加醋酸CO32－＋2CH3COOH＝2CH3COO－＋CO2↑＋H2O
—Someone helps you when you are in trouble. What should you say to them?
—I say “________” to them.
