有一个英文句子有些不太懂的地方。I have some problems with this sentence as follows.

    As we all know that GPA stand for Grade Point Average which may range from 0.0to  4.0 .

I think the "stand"should plus "s".Who can tell me  why?

在英语中表一些来修饰不可数名词的有哪些 I need some examples .

Travel to YiXianTian It was my first time that I had been to visit YiXianTian.Firstly,I must say it's a beautiful place,where you can enjoy the mixture beauty of moutain and water.In my views,it's my most meaningful travel this year.Here are the reasons. First,there are many facilities such as electric ox,floating on the river and so on.It makes me feel extreme happy and excited.Secondly,the hotel there is also satisfying which serves not only mild water but also free WiFi. The last but not least,after the trip,I feel tired and can'run anywhere .Tired though I am ,I still full of satisfactory because I know the power of nature is gigantic.