2. The prices are dropping quickly, back to below three dollars a
gallon in many areas.
价格下降的非常快,在很多地方又回到一加仑三美元以下。
3. Keeping your tires inflated properly can improve gas mileage by more than 3%. Every
gallon of gasoline saved keeps 20 pounds of carbon dioxide out of the atmosphere!
保持轮胎充气能令每单位燃料的行驶哩数增加超过3%。而每节省一加仑汽油,大气中的二氧化碳就能减少20磅。