Books are made paper while paper is mainly made wood.A．of; ofB．f

Books are made __________ paper while paper is mainly made __________ wood.

A．of; of

B．from; from

C．of; from

D．from; of

答案

C解析:
能看出原材料用be made of；不能看出原材料用be made from，故答案选C。

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Books are made __________ paper while paper is mainly made __________ wood.A．of; ofB．f

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Books are made paper while paper is mainly made wood.A．of; ofB．f