为何选the more patient?

有一读者问: 有一道题:

(1)Of the two teachers the lady in green is _____.

A. more patient B. the more patient

答案是B,为什么?

因为the more patient=the more patient one。再如:

(2)He is the taller of the two.

(3)William Pitt the elder was a politician like his son.

有时则用one,如:

(4)Here are two apples: you may take the bigger one.

the more亦可用于副词,如:

(5)Of the two boys John behaves the more politely .