小题1:D
小题2:D
小题3:B
小题4:C
小题1:细节判断题。由文章第二段最后一句可以得出答案。
小题2:细节判断题。由文章第四段第一句话的内容可以得出答案。
小题3:推理判断题。由文章最后一段最后一句的内容可知，这一系统不仅能给楼房供暖，还可以使牛路上的冰雪融化。
小题4:文章结构题。前面谈到这一系统的工作原理以及冬天怎么给楼房供暖，下文应该讲的夏天怎么给楼房降温。
Sometimes, the simplest ideas are the best. For example, to
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