题目内容
【题目】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：邮票是由纸制成的......。故选A。
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题目内容
【题目】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：邮票是由纸制成的......。故选A。