What does the passage mainly discuss? Which of the following was seen as a disadvantage of the postage stamp?

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问题 What does the passage mainly discuss?
Which of the following was seen as a disadvantage of the postage stamp?

选项 A、It had to be purchased by the sender in advance.
B、It increased the cost of mail delivery.
C、It was difficult to affix to letters.
D、It was easy to counterfeit.

答案A

解析
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