点P(2﹣a,2a﹣1)到x轴的距离为3,则a为[ ]
A. 2
B. ﹣2
C. 2或﹣1
D. ﹣1
答案:C
按服务性质分,现代化的运输业可分为()和()。
_______ was most important to her, she told me, was her family.
A. It B. This C. What D As