a pizza是可數名詞嗎

　　I had a whole pizza to myself.

　　我獨自吃了一整個比薩餅。

　　I always keep a pizza in the freezer as a standby.

　　我總會在冰箱裡放一個比薩餅應急。

　　We ate a pizza between us.

　　我們合吃了一張比薩餅。

　　Is there any pizza left?

　　還有比薩餅嗎？

　　He cut the pizza into bite-sized pieces.

　　他把比薩餅切成一口一塊的小塊。