Who runs faster,Larry or Jim?这句对.
fast在这里是副词,副词的比较级前一般是不加the,最高级前可加the也可不加the.
副词比较级加the的情况是：当副词的比较级前面或后面有表示原因或目的的词语.e.g.for,vedause,on acccount of,to do something,and so on.
例如：I will help you the more willingly because I know your father.
We do not like him the less on account of his faults.
She raised herself in the bed,the better to watch the dog.
表示两者间比较的句型：the+比较级+of the two
表示“两者中较…的那个人或物”时,在比较级前加定冠词the.
例如：He is the taller of the two.他是两人中较高的那个.
She was the more promising worker of the two.她是两人之中更有培养前途的工人.
这种句型中的比较级一般是形容词的比较级而不是副词的比较级,可以在原句中加上one加以理
He is the taller （one） of the two.
She was the more promising one（＝worker） of the two.
who runs the faster of the two boys?
这句话变成这样就对了：who is the faster（形容词） of the two boys?
或者who runs faster（副词）,Larry or Jim?