单选题：Whyisitsochallengingtodevelopmoreefficientthermoelectricmate

题目分类：英语六级
题目类型：单选题
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题目内容：

Whyisitsochallengingtodevelopmoreefficientthermoelectricmaterials? A．Becauseitisdifficulttodevelopthetechniqueusedintheprocess.
B．Becauseitwillcostalargesumofmoney,withnospecialfunds.
C．Becausethephysicalcharacteristicsofamaterialarerelevant.
D．Becausethefeaturesofamaterialcannotbeeasilychanged.

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