2. 外语
  3. The passage mainly discusses the factors leading to plastic bag pollution.. The petrol-based bags, though harmless to the envir

The passage mainly discusses the factors leading to plastic bag pollution.. The petrol-based bags, though harmless to the envir

admin2009-09-12  58
问题 The passage mainly discusses the factors leading to plastic bag pollution..
The petrol-based bags, though harmless to the environment, cost too much in manufacture to become widely used.
选项 A、Y
B、N
C、NG
答案B
解析 根据“Greenhouse Gases”部分第二段，生产成本昂贵的环保型塑料袋是以corn为生产原料，而非petrol-based。
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大学英语四级

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