3．Peoplebreathe（呼吸） more slowly when they are asleep．

分析 當(dāng)人們睡著的時候，他們呼吸地更慢了．

解答 答案：breathe
此處在主句中作謂語；根據(jù)從句when they are asleep使用了一般現(xiàn)在時可知，本句描述的是人們睡著時的通常狀況，所以這里應(yīng)使用一般現(xiàn)在時；由于主語People表示復(fù)數(shù)，故填breathe

點評 本題考查了單詞拼寫；做類似的題時，除了掌握單詞的正確拼寫外，還應(yīng)結(jié)合句意，從語法分析的角度去判斷句中所填單詞的形式；在本題中，由于空缺處在主句中作謂語，并且根據(jù)從句的時態(tài)以及主語的單復(fù)數(shù)形式，確定出了此處所填單詞的形式應(yīng)是動詞原形breathe．

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