The passage is mainly about why and how to plant more trees to make universities become green. Those conventional buildings req

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问题 The passage is mainly about why and how to plant more trees to make universities become green.
Those conventional buildings require improvement because they reveal that energy is

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答案cheap and plentiful

解析 由题干中的conventional,building,energy和reveal定位到第四段第二句“What message does a conventional campus send?" asks David Orr,who teaches environmental studies at Oberlin.“It sends the message that energy is cheap and plentiful.”此处需要填入表语成分。通过定位句可知,传统建筑因为没有重视节能,所以给人传递的信息就是能源既便宜又充足,由此可知此处答案为.cheap and plentiful。
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