这里用虚主词it作为强调感觉的句型。第二句的surprise显然比第一句醒目多了。再举几个例子：

It disappoints me that you can't visit us next week.

我真失望你下星期不能来我家。

It angers my father that you have decided to leave home.

我爸爸真生气你决定要离家他去。

另外一个it的用法就是代表时间：

A: What time is it?

几点了？

B: It's four o'clock.

四点。

还有天气：

It's cloudy today. I think it's going to rain.

今天多云，我想会下雨。

这些都是代替第三人称单数名词之外的特定用法。

Most models only eat once a day. If they can do it, so can we.这里的

it代替的是：...only eat once a day。

A: Are you saying I can look like Coco?

B: You got it!

第二个句子属于口语惯用法，意思是You have understood correctly.（你的理解正确。）

同类的说法还有：

You don't get it, do you?

「你弄不懂，对不对？」

it是个小兵立大功的单字，功能多，意义广，有空不妨专门研究一下it的用法。

完。。。