2. 外语
  3. The pilot of a small aircraft with a 40-gallon fuel tank wants to fly to Cleveland, which is 480 miles away. The pilot recognize

The pilot of a small aircraft with a 40-gallon fuel tank wants to fly to Cleveland, which is 480 miles away. The pilot recognize

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问题 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?
选项 A、2
B、4
C、12
D、40
E、160
答案B
解析 For an aircraft with a 40-gallon tank to fly 480 miles, it must average at least 480/40=12 miles per gallon. 12-8=4.
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