I __________my sister but she has one serious _________.

A．likes ;shortcomings

B．enjoys; shortcomings

C．was fond of ;shortcoming

D．am fond of; shortcoming

在独立等概的条件下，M进制码元的信息量是二进制码元的（）倍；在码元速率相同情况下，M进制码元的息速率是二进制的（）倍。