— I heard they went skiing in the mountains last winter.

— It _____ true because there was little snow there. [ ]

A. may not be

B. won't be

C. couldn't be

D. mustn't be

建筑企业施工期问将其塔吊租赁给同一现场其他企业的收入属于（）。

A.主营业务收入

B.提供劳务收入

C.建造合同收入

D.其他业务收入