下列离子方程式书写正确的是（　　）

A．AgNO₃溶液中滴入少量的Na₂S溶液2Ag⁺+S^2-→Ag₂S↓

B．过量CO₂通入Ca（ClO）₂溶液中ClO^-+CO₂+H₂O→HCO₃^-+HClO

C．向Na₂CO₃溶液中加入过量CH₃COOH溶液CO₃^2-+2H⁺→CO₂↑+H₂O

D．向Ba（OH）₂溶液中加入少量NaHSO₃溶液2HSO₃^-+Ba²⁺+2OH^-→BaSO₃↓+SO₃^2-+2H₂O

The _______ contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk

A．payment

B．production

C．shipment

D．insurance