题目内容：
There are a lot of materials which can be used for making paper, but the superiority ones are __[A] woods, cottons and grasses
[B] soft wood and cotton
[C] soft wood, cotton and rags
[D] cottons and grasses
参考答案：
答案解析：
填空题：There are a lot of materials which can be used for making pa
- 题目分类：英语四级
- 题目类型：填空题
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[A] woods, cottons and grasses
[B] soft wood and cotton
[C] soft wood, cotton and rags
[D] cottons and grasses