分析 本文屬于說明文閱讀,作者通過這篇文章向我們介紹了關于我們?yōu)槭裁丛谛碌牡胤剿缓糜X的原因,在我們睡覺的時候一半的大腦仍然保持清醒.
解答 51.B 推理判斷題,根據第四段The researchers measured brain waves (測量腦波) for 35volunteers over two nights in a laboratory.The two nights were a week apart (間隔)可知研究人員對志愿者測試腦波超過兩晚,而這兩次中間有一周的間隔,由此推知,一共測試了兩次,故選B.
52.D 細節(jié)理解題,根據第四段They found during the first night the left half of the brain was more active than the right half.This was during the first deep-sleep period,the researchers said.可知研究人員發(fā)現在第一次深睡眠期間大腦左半部更活躍,故選D.
53.C 細節(jié)理解題,根據倒數第二段Researchers did not keep measuring brain waves all night long.So,they don't know if the left half keeps"watch"all night,or whether it"works in shifts (輪換) with the right half later in the night"可知如今仍然存在的問題是研究人員沒有整夜測量,因此他們不知道是左大腦一直活躍還是與右大腦替換,故選C.
54.A 詞義猜測題,根據 最后一段For some,this research may be calming.It is good to know that our brain is"looking out for us"in a new place.可知對于一些方面來說是令人高興的,知道我們的大腦在為我們尋找一個新地方是好的,故選A.
55.D 主旨大意題,根據第一段Have you ever had trouble sleeping in a new place以及通讀全文可知作者通過這篇文章主要向我們介紹了為什么我們在新地方睡不好覺的原因,故選D.
點評 考查學生的細節(jié)理解和推理判斷能力.做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確選擇.在做推理判斷題時不要以個人的主觀想象代替文章的事實,要根據文章事實進行合乎邏輯的推理判斷.
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