a pizza是可数名词吗

　　I had a whole pizza to myself.

　　我独自吃了一整个比萨饼。

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

　　我总会在冰箱里放一个比萨饼应急。

　　We ate a pizza between us.

　　我们合吃了一张比萨饼。

　　Is there any pizza left?

　　还有比萨饼吗？

　　He cut the pizza into bite-sized pieces.

　　他把比萨饼切成一口一块的小块。