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

A．payment
B．production
C．shipment
D．insurance

数字出版的发展有赖于技术背景、市场需求背景和（）。

A.产业升级背景

B.资本运作背景

C.人口增长背景

D.能源开发背景