the writing brushes ____ bamboo and animal's hair

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the writing brushes ____ bamboo and animal's hair
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the writing brushes ____ bamboo and animal's hair
the writing brushes ____ bamboo and animal's hair

the writing brushes ____ bamboo and animal's hair
因为毛笔的构成没有经过化学的变化,只是形 态的变化,没有本质的变化

be made of 可以看出原材料,而be made from 看不出原材料。 所以是 are made of。
望采纳!

are made of