题目内容：
Whichofthefollowingstatementsbestexpressesthemainideaofthetext? A．Driverscouldchangetheirdrivinghabitsandkeeptheircarsingoodshape.
B．Theimportanceofsavingfuelisseverelyignored.
C．Savinggasisimportantandcouldbedoneinseveralways.
D．Peopleshouldusefewerautomobilesandmakegooduseoftelephones.
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答案解析：