大学英语：用指示代词this,that,these和those以及相应的限定词组如this statement和those statements等来照应前面

The wording of this letter is almost the same as that used earlier by my English teacher.

Do you remember the 1940s,those terrible years?

Six weeks!I can’t wait that long.

在表示时间、空间概念时，指示代词this/these一般表示的含义近一些而that/those表示的含义远一些。

Sometimes we laugh when we recognize ourselves in what we hear or see.This statement,therefore,often receives a smile：“Advice is always given but never taken.”

We went to the suburb last week and that was our first outing this year.

在含有比较级的句子中，that/those可以照应上文提到过的具有特指意义的可数名词，而this/these不能这么用。

The manager’s salary is twice as much as that of his secretary.

These computers are nicer to look at than those we have in our company.