vegetables是可數還是不可數

　　The vegetables were planted in neat rows。

　　蔬菜一行行種得整整齊齊。

　　Their diet consists largely of vegetables。

　　他們的日常飲食以蔬菜為主。

　　Their diet consisted largely of vegetables。

　　他們的日常飲食以蔬菜為主。