GMAT语法有很多零散的知识点，这些知识点要求我们系统的掌握，从而了解GMAT语法的正确规则，今天我们就给大家说一下GMAT语法指代it/that/they用法讲解。
That/those表示“同类指代”，也就是“核心词指代”，只指代“核心名词”，不带名词的修饰成分。
That/those后面通常在加上其他成分，表明与前面名词的不同。
It/they表示“同物指代”，指代的名词就是前面加了一堆限定的名词。
出现it/they一定是自己跟自己比，要么是时间上的不同，要么是空间上的差异。
【In Japan】 elderly people are treated with far GREATER respect THAN they are 【in most Western countries】
They指代elderly people，老年人与老年人比，比较的是【in Japan】和【in most Western countries】
在than或as后面补出的如果是it/they/I/he/...等，表示同一事物的比较时候，than后面的主语是可以省略的(连同谓语)。
I walk as fast now as [I walked] when I was a child.
还有一种特殊情况：those/it指代“核心词”，虽然不是同一个事物，但是than后面也可以省略(可能还会连同其他成分)。关键是要明确比较的重点。
例1. According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women【over the age of thirty】 than【under it】.
Than后面省略了those born to women
例2. Only seven people this century have been killed by the great white shark, the man-eater of the movies—fewer than [have been killed by bee stings].
最初认为，than后面省略了those(指代people)。
但是有理解说，这里比较的并不仅仅是only seven people，后面的have been killed也在比较范围之内。所以不能是fewer than those killed by bee stings，因为这样就变成了seven people 和“被蜜蜂杀死的人”的比较。
同意上述观点。
这里应该补出完整的比较：
Only seven people this century have been killed by the great white shark, fewer than [people have been killed by bee stings].但是这种说法是不符合语法规则的。Than后面不能在加上一个句子。
所以，这时候的省略就是必须的!
例3. According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than [that of] livestock fed on grain and more of a kind of fat thought to be good for cardiac health.
That of不能省略，因为比较的是fat。
例4. In addition to having more protein than wheat does, rice has protein of higher [quality] than [that] in wheat, with more of the amino acids essential to the human diet.
That指代protein，不能省略。也可以这么说：
[Rice] has protein of higher quality than [wheat] does
》》点击了解GMAT语法代词指代的考点内容（一）
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