题目内容
12．Have you ever （41）stayed （stay） up late？If so，you know that not getting enough sleep can make you tired．Not sleeping enough can also make （42）it hard to think clearly the next day．Sleep scientists have long known that getting a good night's sleep is of greatimportance（43）importance （important）．It helps kids to be able （44）to do （do） their best during the day．
A recent study shows that sleep （45）helps （help） improve problem-solving skills and（46）creative（create） thinking．For the study，two groups of students answered （47）a math problem．The group that slept for eight hours solved the problem （48）correctly （correct） more often than the group that did not get enough sleep．
While you sleep （49）at night，your brain is busy doing its"homework"．It sorts out （整理） the information （50）that/whichyou get in the day．Getting enough sleep each night can improve your thinking ability．That will surely help you do your best at school．Experts say that，in return，can lead to better grades．
分析 本文主要讲述足够的睡眠是必要的，足够的睡眠能提高解决问题的技能和创造性思维．对于学生来说，足够的睡眠能提高思维能力，导致更好的成绩．
解答 41．stayed 考查时态．此处是现在完成时态，stay的过去分词是stayed．
42．it 考查it用法．it作形式宾语，真正的宾语是动词不定式短语to think clearly the next day．
43．importance 考查名词．"of+抽象名词"构成的短语相当于该抽象名词的同根形容词，即of great important=very important．
44．to do 考查动词不定式．be able to意为"能，会"，后接动词原形．
45．helps 考查主谓一致．本文讲述的是一般事实，用一般现在时态，因主语sleep是单数三人称形式，谓语动词用单数三人称形式．
46．creative 考查形容词．thinking是名词，其前用形容词作定语．
47．a 考查冠词．problem是可数名词，其前用不定冠词a表示泛指．
48．correctly 考查副词．solve是动词，用副词修饰．
49．at 考查介词．at night意为"在夜里"，是固定搭配．
50．that/which 考查定语从句．分析句子结构可知这是一个定语从句，先行词information在从句中作宾语，用关系代词that/which．
点评 题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
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