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English Passage단락 내 문장을 터치하면 즉시 발음이 재생됩니다
[1]As the quality of air is becoming poorer and poorer, private organizations are trying to make the air cleaner.[2]In spite of their continued efforts, factories and cars are still producing too much dirty smoke of putting too chemicals into the air.[3]The time may soon come when we have to take an oxygen tank with us wherever we go.