英语分钟可数还是不可数名词

例句：

Can I interrupt you just for a minute?

我可不可以打断你一会儿？

She stared stonily at him for a minute.

她冷冷地盯着他看了片刻。

The cost has gone up to $1.95 a minute.

价格已涨到了一分钟$1.95。