$,bLK|<hi 同現是一種詞匯的銜接手段。完型文章由于常常有明確的中心主線，所以作者往往會使用一些重點詞匯圍繞著中心主線貫穿全文。同現實際上就是一組具有相同傾向性的詞語，這些詞語所表現的傾向性往往與中心主線中的導向一致，或者說這些同現詞語的任務就是對文章的導向進行展開支持。因此，文章的整體導向這個已知線索可以成為解出這些同現詞語的關鍵信息。
qHt!)j9GKv 例題
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“Sleep is dividedintoperiods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of non-REM sleep. (41 Neitherkind of sleep is at all well-understood, but REM sleep is 42 to serve some restorative function of the brain. The purpose of non-REM sleep is even more 43 .”
/o*r[g7< [A]subtle[B]obvious[C]mysterious[D]doubtful
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U=~q 答案：[C]mysterious
)F,H(LblH 分析：此篇文章有非常明確的中心主線。文章首句-Sleep is dividedintoperiods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of non-REM sleep.(睡眠分為兩種：REM sleep和非REM sleep)，探討兩種睡眠就是本文的主題。下一句- 41(答案：Neither) kind of sleep is at all well-understood(兩種睡眠都沒有被很好地理解)，這就是文章的基本導向。
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