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¡¡¡¡The purpose of non-REM sleep is even more __43__. The new experiments, such as those described for the first time at a recent meeting of the Society for Sleep Research in Minneapolis, suggest fascinating explanations __45__ of non-REM sleep. (95)
¡¡¡¡43. A. subtle B. obvious C. mysterious D. doubtful
¡¡¡¡45. A. in the light B. by virtue C. with the exception D. for the purpose
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