C. 1:50、 1: 100

[Analysis] The main knowledge points examined in this question are the common proportions of building plans, elevations and sections.

[Key points of dialysis] The common proportions of building plans are 1:50,1:100; The building facade should be consistent with the proportion selected in the plan; The scale of the building profile is generally the same as that of the plan, and a larger scale can be adopted.