As running a car is a great       , many people prefer to ride to their offices;      benefits both their bodies and the environment.

       A．luxury; which      B．expense; it           C．burden; it            D．value; which

As running a car is a great       , many people prefer to ride to their offices;      benefits

both their bodies and the environment.

A．luxury; which          B．expense; it          C．burden; it          D．value; which