He worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.

A．at the mercy of

B．at the risk of

C．at the cost of

D．at the service of

在“十三五”规划期间，中央应当（）。

A.统筹全局

B.积极鼓励地区开展联合协同治理

C.签订地方环境治理合作协议

D.为地区协同治理创造平台和机会