根据网考网考试中心的统计分析，以下试题在2017/12/21日托福考试习题练习中，答错率较高，为：93%
【单选题】 Why does the author mention feldspar in line 10
A．(It is often used as a substitute for clay
B．( It is damaged by the oxides in clay
C．( Its presence indicates inferior clay
D．( It is a major component of clay
网考网参考答案：D，答错率：93%
网考网试题解析：
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