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 This is _____ unhealthy lifestyle.   
A.theB.\C.aD.an
D
考查冠词。句意:这是一种不健康的生活方式。结合语境可知泛指任何一种不健康的生活方式,故用不定冠词。Unhealthy词首音素是元音,故不定冠词用an,选D。
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