A gallon of milk weighs eight pounds, so you wouldn’t try to carry three or four gallons home on your bicycle.  Gasoline is a bit less dense than milk—oil floats on water—and 6 pounds per gallon of gasoline is about right.  In the previous question, you looked at how many gallons of gasoline are used by a driver. A typical driver used about 600 gallons per year, with a high-use driver hitting 2000 gallons per year and a low-use driver only 200 gallons per year. Now, how much would the gasoline used by a low-use driver weigh? Hint: The number of gallons per year, multiplied by the weight of gas as given previously, gives you the weight of gasoline burned per year:单项选择题

A

1,200 pounds / year

B

120 pounds / year

C

12,000 pounds / year

D

120,000 pounds / year

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