A low-carbon lifestyle is of great benefit to improve_____ world environment. Nothing can be enjoyed from it until you have____ deep understanding of it, though.
A．a; theB．/; aC．the; /D．the; a
D
考查冠詞.結合語境可知上文特指世界的環(huán)境,故用定冠詞.下文泛指任何中深入的理解,故用不定冠詞,選D.
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