Every year large quantities of water in the rivers _______ polluted and _______ money is spent solving this problem.  [ ]

A. is; a huge amount of

B. are; a huge amount of  

C. are; huge amounts of

D. is; huge amounts of

为了防止循环水系统中菌泥的危害，一般要对循环水进行（）。

A、消毒处理

B、过滤处理

C、中和处理

D、软化处理