2. 外语
  3. Thermoelectric materials______waste heat into electricity, but often achieve high conversion efficiencies only high temperatures

Thermoelectric materials______waste heat into electricity, but often achieve high conversion efficiencies only high temperatures

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问题 Thermoelectric materials______waste heat into electricity, but often achieve high conversion efficiencies only high temperatures.
选项 A、convert...at
B、dominate...at
C、transform...on
D、tackle...on
答案A
解析 A选项convert意为“转化”；at high temperature为固定词组，意为“在高温下”。根据句意：“热电材料将废热转化为电能，但通常仅在高温下才能实现高转换效率”，故选A。 在其他三项中，B选项dominate：主导；C选项transform：改变，转化；D选项tackle：处理，与……交涉，都不符合句意。
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