2. 外语
  3. The main cause of pollution is ______. Food packages, bottles and tins for drinks can cause ______.

The main cause of pollution is ______. Food packages, bottles and tins for drinks can cause ______.

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问题 The main cause of pollution is ______.
Food packages, bottles and tins for drinks can cause ______.
选项 A、air and water pollution
B、both a litter problem and a waste of resources
C、to pay for the service
D、to produce the receipt
答案B
解析 第二段第四句：This not only causes a litter problem, but also is a great waste of resources...“这不仅造成了垃圾的问题，而且也是资源浪费。”this指前面的food packages，bottles and tins for drinks这些东西。
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成人本科学位英语

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