Our enemy bills have been increasing steadily．     these costs，our telephone costs have doubled over the past six months．

A．Moreover

B．In addition to

C．As a result of

D．Contributing to

特殊的路基类型包括( )。

A．软土地区路基

B．滑坡地段路基

C．岩溶地区路基

D．沙漠地区路基

E．黄土地区路基