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分析 本篇书面表达属于提纲类作文，根据提示信息，写作时注意以下几点：1、仔细阅读有关提示，弄清试题提供的所有信息，要点包括：：（1）健康之重要人尽皆知．（2）许多青少年不注重健康问题，假期尤甚．长时间看电视，通宵上网聊天、玩游戏．导致的危害如：影响视力，身体虚弱，缺乏人际交往．2、提纲是文章的总体框架，要在提纲的范围内进行分析、构思和想象．要依据提示情景或词语，按照一定逻辑关系来写．本文写作时可以按照要点所给的顺序写．3、根据要表达的内容确定句子的时态、语态．4．注意使用高级词汇和句式，以增加文章的亮点．
【亮点说明】本文结构紧凑，层次分明，而且使用了多种表达：as we all know 众所周知；pay attention to 注意，重视；spend time doing sth．花费时间做某事；have a bad effect on 对…有不良影响；take exercises 锻炼
Only when we are healthy can we study well and enjoy life．（高分句型一）
And they spend too much time watching TV，playing games and chatting on the Internet all night，which is bad for their health．（高分句型二）
Thirdly，they will lose the chance to communicate with others face to face as they never go out，which may have a bad effect on their mental health．（高分句型三）
解答 Have a healthy lifestyle
As we all know，health is very important．Only when we are healthy can we study well and enjoy life．（高分句型一）
However，many teenagers don't pay any attention to their health，especially during the holiday．And they spend too much time watching TV，playing games and chatting on the Internet all night，which is bad for their health．（高分句型二）First，this may make them get near-sighted．Besides，their bodies become much weaker．Thirdly，they will lose the chance to communicate with others face to face as they never go out，which may have a bad effect on their mental health．（高分句型三）
In my opinion，they should spend less time in front of the TV or the computer．Go out to take some exercises，play some sports and visit some and have a healthy lifestyle．
点评 英语写作是一项主观性较强的测试题．它不仅考查学生的写作基础而且还考查学生在写作过程中综合运用语言的能力．在撰写时要注意主谓语一致，时态呼应，用词贴切等．要提高英语写作水平，需要两方面的训练：一是语言基础方面的训练，要有扎实的造句、翻译等基本功，即用词法、句法等知识造出正确无误的句子；二是写作知识和能力 方面的训练以掌握写作方面的基本方法和技巧．
分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了1970年代被采采蝇咬伤很容易感染疾病，传播病菌，一定要小心．
解答 28．B．细节理解题．根据最后一段There may even be a higher density（密度）of the parasite in the skin than in the blood可知一个采采蝇叮咬的危险是引起皮肤疾病；故选B．
29．D．细节理解题．根据第三段By the 1960s the disease was considered"under control"and had reached very low numbers，making its spread more difficult可知直到上世纪60年代这种昏睡病才得到控制；故选D．
30．A．词义猜测题．根据最后一段That means a person can have no symptoms but still both harbor the disease and spread it可知这意味着一个人可以没有症状，但仍携带疾病病菌并且可以传播它；意为携带；故选A．
31．D．推理判断题．根据文章The finding could explain the mysterious 1970s infection，and why the disease can spring up in areas that had previously been cleared可知最新的研究表明了是皮肤上的寄生虫引起了1970年的感染；故选D．
点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
