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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