Some researchers are finding that daydreaming may be important to     mental health .Daydreaming ,they say, is      good means of relaxation.
A．the; ／B．／; theC．／; ／D．／; a
D

試題分析：考查冠詞。第一空的mental health精神健康是一個抽象名詞，單獨使用，不要冠詞；第二空用a泛指一種放松的方式。句意：一些研究人員分析白日夢對于精神健康很重要。他們說白日夢是一種很好的放松的方式。故D正確。
點評：冠詞的辨析集中在the表示特指，a/an表示泛指。另外要注意抽象名詞，物質(zhì)名詞前面不需要使用冠詞。
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