this和that都可代表前面提到過的事情,若出現(xiàn)兩個名詞,指代前面的用that指代較后面的用this;但若指下文將要敘述事情,則只能用this,不能用that.此外,還可用于代替上文中出現(xiàn)過個單數(shù)或不可數(shù)名詞,且后面帶有of短語修飾.
　　Health is above wealth; this cannot give so much happiness as that.
　　健康勝于財富;財富不會像健康那樣帶來那么多幸福(句中this=wealth;that=health)
　　They cant afford it.That/this is their problem.
　　What I want you to remember is this :English is of great use.(此句中this不能用that替換)
　　The popula tion of Shanghai is larger than that of Suzhou.
而你給出的考題中,Partly that reflects the greater specialization~~~~這個句子仍然是與上文a few of the procedures or methods相關(guān)所要陳述的內(nèi)容.這就運用了：若指下文將要敘述事情,則只能用this,不能用that.