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  3. Traditionally, garbage is thought to be ______. A lot of cities are trying new ways to treat garbage mainly because ______.

Traditionally, garbage is thought to be ______. A lot of cities are trying new ways to treat garbage mainly because ______.

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问题 Traditionally, garbage is thought to be ______.
A lot of cities are trying new ways to treat garbage mainly because ______.
选项 A、their environment is becoming more and more dirty
B、the traditional ways of treating wastes are not efficient
C、they are short of useful materials
D、they need new materials made from garbage
答案B
解析 本题为细节推理题。传统的处理方法中，人们只管把垃圾扔出去就了事了。但这种垃圾处理方法已经不合时宜，会造成垃圾成山、浪费资源、污染环境。因此许多城市开始试验用新的方法来处理越来越多的垃圾问题。
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