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
