cola是可数还是不可数名词

　　It costs as low as a can of cola.

　　只需一罐可乐的介钱。

　　John: I'd love some cola, please.

　　约翰：请给我可乐。

　　I would like soda rather than cola.

　　我喜欢喝苏打水，而不是可乐。