The earthquake and the heavy losses ________contributed to disabled this family to afford his education.

A．that

B．it

C．what

D．which

台湾岛修建的铁路是半环状的环岛铁路，没有直接联系东西部的横向铁路，其主要的影响因素是[ ]

A．气候

B．河流

C．地形

D．矿产