托福TPO 8 听力Lecture第3篇第2题_According to the professor, what was an advantage of using clear glass instead of quartz to make reading stones?

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题目

According to the professor, what was an advantage of using clear glass instead of quartz to make reading stones?

Clear glass was easier to find than quartz.

Clear glass was easier to cut to the appropriate size.

Clear glass magnified the letters more than quartz did.

Clear glass was less expensive than quartz.

题目解析

根据教授所说内容 “But rocks like quartz, well, quartz of optical quality weren’t cheap. Late in the 13th century, glass makers in Italy came up with a less expensive alternative.” 可知，相比于石英石，clear glass 会更便宜一些。所以选项 D 正确。

答案: D

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