题目内容：
Whichofthefollowingdoestheauthordescribeasthemostappealingfeatureofmethanol?
A．itissubstantiallylessexpensivethanethano B．Itcouldbeprovidedtoconsumersthroughtheexistingmotorfueldistributionsyste
C．Ithasahigherenergycontentthanotheralternativefuel
D．Itsusewouldreducethevehicleemissionsdrasticall
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答案解析：