It is already 10 o’clock. I wonder how it ______ that she was two hours later on such a short trip.

A．came over

B．came out

C．came about

D．came up

图3为“某地区等高线地形图（单位：米）”，读图回答下列各题。

如果将图中的比例尺扩大为原来的2倍，图示区域实地范围不变，图幅面积要增加（）

A.1倍

B.2倍

C.3倍

D.4倍