听句子，缩写原文。（）

A．Insurance is unnecessary for the transportation of goods.

B．Insurance is a factor that affects the price of goods.

C．Insurance contributes to reducing the price of goods.

D．Insurance helps improve the quality of goods.

医患关系的特点是（）

A.以医疗活动为中心，以维护健康为目的

B.是帮助性的人际关系

C.以患者为中心

D.以上均是