My father bought a big house _____ a garden _____ the money. [ ]

A. at; with

B. with; with

C. with; about

D. with; by

社会保障的本质是（）。

A.维护社会公平进而促进社会稳定发展

B.降低不公平事件的概率

C.满足全体公民的所有要求

D.实现全社会的文明