单选题：What'stheweaknessoftheexistingthermoelectricmaterialcompound

题目分类：英语六级
题目类型：单选题
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题目内容：

What'stheweaknessoftheexistingthermoelectricmaterialcompound? A．Itcan'tstandthetemperaturesrequired,containingrareandharmfulelements.
B．Itmayloselargescaleofenergywhileconvertingheatintoelectricity.
C．Itcan'tprovideenoughheattoproduceelectricityaspeopledesired.
D．Thecosttomakethecompoundistoomuchforanyonetobear.

参考答案：

答案解析：

Whyisitsochallengingtodevelopmoreefficientthermoelectricmate

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