2. 外语
  3. This passage explores how wildfires are born and live. There are three components needed for ignition and combustion to occur:

This passage explores how wildfires are born and live. There are three components needed for ignition and combustion to occur:

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问题 This passage explores how wildfires are born and live.
There are three components needed for ignition and combustion to occur: fuel, air and ______.
选项
答案a heat source
解析 此题为细节题。题目涉及的是three components needed for ignition and combustion(点燃和燃烧的三要素)。由此可将目标锁定在此句中：There are three components needed for ignition and combustion to occur．A fire requires fuel to burn，air to supply oxygen，and a heat source to bring the fuel up to ignition temperature．显然此处应填a heat source。
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大学英语四级

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