Susan's Healthy Gourmet can offer you the service of ______.

A．Because gardening is something like art and science.
B．Because they regard it as a productive activity.
C．Because it gives them pleasure to spend time in winter.
D．Because vegetables can grow in gardens even in winter.

A．It's necessary to do regular work in vegetable gardens.
B．If one's garden is too large, he will fail to plant good vegetables.
C．Vegetable gardening can help people develop a healthful hobby.
D．Gardens in cities don't offer as many benefits as those in the countryside.