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    【题目】【原创】 Green roofs have an ______effect, helping reduce the amount of energy______ to heat a building in winter and cool it in summer.

    A. isolated；needed B. isolating；needed

    C. isolated； needed D. isolating；needing

    【答案】B

    【解析】B。句意：绿色屋顶有隔离效果，能帮助减少建筑冬天加热或夏天制冷所需的能量。isolate动词意为：隔离，孤立；其-ing形式相当于形容词，隔离的，绝缘的；need和所修饰的名词是被动关系，因此用动词的-ed形式。故选B。

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