555.This new model of car is so expensive that it is _____ the reach of those with average incomes.

A.over

B.within

C.beyond

D.below

556.We hadn't planned to meet.We met _____ chance.

A.of

B.in

C.for

D.by

555.答案是C;

over表示数目，程度超过，多于；within在…之内；beyond（表示范围，限度）超出;below在…以下。

556.答案是D;

by chance偶然地。