( )是社会保障体系中的最低纲领。
A.社会保险
B.社会救助
C.社会福利
D.社会优抚
参考答案:B
As its name __________, the Volunteer Farm relies on volunteers to weed, plant and harvest.
A.suggests
B.insists
C.predicts
D.possesses
牙体硬组织开始形成的时间是()
A.蕾状期
B.帽状期
C.钟状期早期
D.钟状期晚期
E.萌出期