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  3. The passage is mainly about why and how to plant more trees to make universities become green. Students in Harvard are encourag

The passage is mainly about why and how to plant more trees to make universities become green. Students in Harvard are encourag

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问题 The passage is mainly about why and how to plant more trees to make universities become green.
Students in Harvard are encouraged to use bulbs of 18 watts apiece.
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答案Y
解析 由题干中的Harvard和18定位到第：三段第一句话At Harvard…when freshmen receive mailings urging them to．．．purchase compact fluorescent bulbs，which use an average of 18 watts apiece instead of 75”。段首及数字处设题。通过分析定位句得知，哈佛大学在新生入学前的通知上鼓励学生购买荧光灯，平均每盏为18瓦，题干与原文相符。
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