The author’s main point in paragraph 1 is that clay deposits Why does the author mention feldspar in line 10?

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问题  The author’s main point in paragraph 1 is that clay deposits
  Why does the author mention feldspar in line 10?

选项 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.

答案D

解析
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