以下出口单价只有( )是正确的。
A．250美元／桶
B．250美元／通ElF纽约
C．250美元／桶CIF广州
D．250美元／桶CFR德国
参考答案：B
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
膜滤因数
