For _______ commodities as oil, sand and timber, rail is cheaper

For _______ commodities as oil, sand and timber, rail is cheaper than road.
A、bulk
B、large quantities of
C、packing
D、packed
【正确答案】：A
【题目解析】：large quantities of意为大量的。句意：对于石油、沙子和木材等大宗商品来说，铁路比公路便宜。