2. 外语
  3. The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy. Urban ozone is

The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy. Urban ozone is

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问题 The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy.
Urban ozone is primarily caused by __________________, which are produced by fossil fuels.
选项
答案unburned hydrocarbons
解析 本题考查fossil fuels带来的问题，具体讲urban ozone的成因，从而将目标锁定在 Problems with the Fossil Fuel Economy下，再在Air pollution下查找相关内容。针对细节题，考生需要找出题干中的关键词，然后通过关键词对原文中的相关内容进行定位，先定位到小标题，然后进一步查找答案出处。
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大学英语六级

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