400-600-1123
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答案：
E
要正确理
费用=有固定的手续费（a fixed processing fee）+ 额外的快递费用（an additional shipping fee ）x 数量
设：X为固定手续费，Y为每一本的快递费用
1月 X+Y
2月 X+2Y
3月 X+3Y
4月X+4Y
5月X+5Y
(1) X+3Y-(X+Y)=1 Y=0.5 X未知 不充分
(2) Y+2Y+3Y+4Y+5Y=7.5 Y=0.5 X未知 不充分
(1)+(2) Y=0.5 X未知 不充分
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