What is the price difference between airmail service and postal service?
A.6 dollars
B.6. 8 dollars
C.8. 8 dollars
D.8 dollars

A.6
B.6.
C.8.
D.8

【参考答案】

A
解析：题干有“price difference”即“差价”这个词语，可据此推测文中可能会提到两个及以上的数字......

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