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题库 / OG2019-SC-729
Many utilities obtain most of their electric power from large coal and nuclear operations at costs that are sometimes two to three times higher as that of power from smaller, more efficient plants that can both make use of waste heat and take advantage of the current abundance of natural gas.
two to three times higher as that of power from smaller, more efficient plants that can both
higher by two to three times as that from smaller, more efficient plants that both can
two to three times higher than those for power from smaller, more efficient plants that can both
between two to three times higher as those for power from smaller, more efficient plants that both can
between two to three times higher than from smaller, more efficient plants that they can both
题目分析：许多公用事业从大型煤炭和核能获得电力，以比从小型的、效率更高的、可以即利用废弃热能又利用当下大量的天然气优势的厂家高出两到三倍的成本。
选项分析：
形容词比较级（higher）与than搭配；对比的是成本（costs，复数形式），所以只能用those，排除A B D。且B D中的both...and...为平行触发语，未划线部分没有can，所以both要放在can之后。
E中，plants之后that引导的从句不缺成分，因此不能看作是定语从句，而要看成同位语从句。但逻辑上来说，应该是“即利用废弃热能又利用当下大量的天然气优势 的 plants”，而不是用“他们即利用废弃热能又利用当下大量的天然气优势”来解释说明plants。
higher than
costs----those
both and
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