Last year, Linda made __________ her brother did though he had a better job. [ ]

A. twice as much money as      

B. twice as many money as

C. two times money more than  

D. twice more money as

为保证模拟信号经过采样而不丢失信号，采样频率必须不低于信号频带宽度的（）

A.4倍

B.8倍

C.10倍

D.2倍