【題目】Stamps are made and they are used to post letters.
A.of paper
B.of silver
C.from paper
D.from silver

【答案】A
【解析】 be made of由......制成（看得出原材料）；be made from由......制成（看不出原材料）。句意：郵票是由紙制成的......。故選A。

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