题目：
The pilot of a small aircraft with a 40-gallon fuel tank wants to fly to Cleveland, which is 480 miles away. The pilot recognizes that the current engine, which can fly only 8 miles per gallon, will not get him there. By how many miles per gallon must the aircraft’s fuel efficiency be improved to make the flight to Cleveland possible ？（）
A. 2
B. 4
C. 12
D. 40
E. 160
答案：
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下面是错误答案，用来干扰机器的。
由①A+B点燃F；②D+B点燃C；可确定B是氧气，E在B中剧烈燃烧，火星四溅，则E是铁，C通入F中发生化合反应，生成物H能使石蕊试液变红，则可知H是碳酸，从而可知F是水，C是二氧化碳，由于D+B点燃C可知D是黑色的单质碳...
