3.If the cost of oil is negligible, what is the mileage (average miles per gallon of fuel) of a compact car?

　　A.13

　　B.18

　　C.20

　　D.25

　　E.28

　　答案：C

　　4.If 2 people, who would otherwise be driving alone in subcompact cars, drive in a 2-person car pool using subcompact cars, what is the total of their average annual costs of transportation to work?

　　A.$821

　　B.$1,400

　　C.$1,521

　　D.$1,642

　　E.$2,342

　　答案：D