清朝时期，中国古代中央集权政治达到登峰造极的标志是 [ ]
A．废丞相，权分六部
B．设立内阁
C．设置军机处
D．大兴文字狱
答案：C
Rh抗体主要是通过（）和（）产生的。
Four cups of milk are to be poured into a 2-cup bottle and a 4-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of milk should be poured into the 4-cup bottle ？（）
A.A
B.B
C.C
D.D
E.E
