that 通常指代 不可数名词
The weather in Beijing is colder than that in Shanghai. (that 指代不中数名词the weather)
one 指代 同一种类的另外一件东西或另外一个人
I bought a pen yesterday. But i lost it. so i want to buy a new one. (one 指代另一只钢笔）
it 指代 原事原物
I bought a pen yesterday. But i lost it.（ it 指代原来丢的那只钢笔）
one指同一类事物（做题时能从上文知道）；
it特指某一个事物；
that可指事也可指物（做题时能从上文知道）。
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