【名词&注释】
不完全燃烧(incomplete combustion)
[单选题]关于燃料的热值，以下说法中正确的是
A. 燃料的热值与燃料的种类有关系，与燃料的质量和燃烧状况无关
B. 燃烧1千克某种燃料放出的热量叫这种燃料的热值
C. 燃料燃烧时，质量越大，热值越大
D. 燃料不完全燃烧时的热值比完全燃烧时的热值小
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举一反三：
[单选题]23． Jay Chou wrote songs ________for two years．
A. for him self
B. for his friends
C. for his mother
D. for Coco Lee, Jacky Cheung and some other singers
[单选题]The door is not ___ for the elephant to pass.30. The door is not ___ for the elephant to pass.
A. wide enough
B. widely enough
C. enough wide
D. enough widely
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