Question

15．It is reported that many middle school students are just not getting enough sleep，especially during the school week．The problem seems to get（41）worse（bad） as they get older．Year 7 students sleep 8.4 hours in a school night，and Year 9 students only 6.9 hours．
    It's also reported that not getting enough sleep can cause （42）problems（ （problem） in a student's life．Many students fall （43）asleep（sleep） in school or while doing their homework，so it is not（44）surprising（surprise） that they get lower grades than those who get enough sleep．Scientists suggest nine hours a night for middle school students．Of the students who feel（45）unhappy（happy） and nervous，73% don't get enough sleep at night．
     Why aren't students getting enough sleep？Many students have one of the（46）following（follow） things，like telephone，television，or computer in their bedrooms．
（47）Using（use） them on a school night not only takes their time away from homework，but also makes （48）itdifficult for them to sleep．As a result，many students can't sleep before 11 p．m，yet they must get up early（49）to go（go） to school．
    Scientists also suggest students should not do exciting activities for an hour（50）beforebedtime．

Answer 1

分析 很多孩子睡眠不足，而且随着年龄增大问题看起来更严重．他们会在课堂上睡着了，所以他们比那些睡眠充足的孩子得分低是不令人吃惊的．为什么存在这个问题呢？主要是电视，电脑，电话的问题．在学习的时间的夜晚玩手机不仅会占用写作业的时间，而且使他们很难入睡，但是第二天他们还需要早起去上学．所以科学家建议孩子在睡前一小时不要坐兴奋的事．

解答 41．worse．考查比较级．根据as they get older可知随着年龄增大问题看起来更严重．所以用bad的比较级worse．
42．problems．考查名词．problem是可数名词，本句里problem前面没有表示数量的词，而且问题肯定不是一个，所以用复数．problems．
43．asleep．考查派生词．固定短语fall asleep表示入睡，asleep是形容词．
44．surprising．考查派生词．根据上文可知that they get lower grades than those who get enough sleep（他们会比那些睡眠充足的孩子得分低）是不令人吃惊的，所以用surprising，表示"令人吃惊的"．
45．unhappy．考查派生词．和nervous并列，表示负面情绪用unhappy．表示"不高兴"．
46．following．考查派生词．following是形容词，修饰名词things表示"下面的事"．
47．Using．考查非谓语动词．Use them on a school night 在句子里做主语，所以用doing．．表示"在学习的时间的夜晚玩手机不仅会占用写作业的时间，而且使他们很难入睡．"
48．it．考查代词．根据makes和difficult for them to sleep可知用it做形式宾语，代指to sleep，表示"使他们很难入睡"．
49．to go．考查非谓语动词．做get up early的目的状语用动词不定式to go，表示"早起去上学"．
50．before．考查前后的逻辑关系．根据常识可知应该在睡前避免做令人兴奋的事，所以用．before．

点评 考查语法填空．
it可以做形式主语和宾语．
1．it用作形式主语
当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾．如：It's a pity to refuse．拒绝是令人遗憾的．
 2．it用作形式宾语
当不定式、动名词、从句等用作宾语且其后跟有宾语补足语时，就应在宾语补足语前使用形式宾语，而将真正的宾语移至句末．如：I find it easy to get on with her．我发现她很容易相处．