This is _____ unhealthy lifestyle.   
A．theB．\C．a(chǎn)D．a(chǎn)n
D
考查冠詞。句意：這是一種不健康的生活方式。結合語境可知泛指任何一種不健康的生活方式，故用不定冠詞。Unhealthy詞首音素是元音，故不定冠詞用an，選D。
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