(单选题)
What did Cai Lun find after he recommended using a mixture of hemp, rags, bark and wheat stalks?
A.The paper was more expensive to make.
B.The paper was not durable.
C.The paper was cheaper to make and also more durable.
D.The paper was not cheaper to make, but more durable.
参考答案：C
参考解析：
细节理解题。根据第二段第六句“He recommended using a mixture of hemp, rags, bark(树皮) and wheat stalks(麦秆), and found that the paper was cheaper to make and also more durable.”可知，蔡伦建议使用大麻、碎布、树皮和麦秸的混合物，发现这种纸制造成本更低，也更耐用。故选C。
知识点：阅读理解四选一 英语专业基础知识 阅读理解 教师招聘-小学 英语
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