The passage gives a general description of both the advantages and disadvantages

游客2023-09-17  6

问题 The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy. [br] 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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