Food, gas and vegetables have been ________ by rail directly to the city ever since the highways

were blocked.[ ]

A. preferred  

B. transported

C. packed

D. rescued

以下属于目前我国工程总承包存在的具体问题的是（）。

A.设计单位的体制尚未彻底转变

B.组织体系不健全

C.缺乏高素质的项目管理人才

D.以上都是