参考答案:A
[听力原文]
W: We have made ten copies.
M: At first it’s planned to need ten copies, and now we don’t need so many. Five would be enough.
该题为数字计算题,根据文中“ten copies”和“Five would be enough”等关键词句,可知多了五份。
A.甘油
B.碳酸钙
C.藻酸盐
D.苯甲酸盐
E.十二烷基(酯)硫酸钠
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