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描述偏峰分布资料离散趋势的合适指标是
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P25～P75范围内的变量值有
Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .As administrators seek to block dangerous email attachments through the recognition of well-known (9) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (10) access to your network. 9（）
Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .As administrators seek to block dangerous email attachments through the recognition of well-known (9) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (10) access to your network. 8（）
阅读下面短文，回答下列五道题。 史学原以记述近现代事实为主要任务，任何时代的近现代史都是史学家的研究中心。史学容易触犯政治禁忌，成为文字狱和其他变相文字狱的主要对象。清代的文字狱几乎等于历史狱。朴学反是，以经学为中心，以小学(文字学)的训诂、音韵等为附庸，在其范围内的诸子、古史考证、地理、方志等等，都和政治现实没有直接关系。清代顺、康、雍、乾文网太密，文字狱大兴之后，史学因为首当其冲而大衰，考证学因为可以避祸而极盛，便是明证。由于中国封建社会历经的时期特别长，君主权威无限大，一切都被严密控制，学术界便越来越明显地出现这种极其反常的怪现象：现代史成为空白点，近代史成为薄弱点，古代史成为集中点，越古越厚，越今越薄，甚至有古无今，许多学者都成为“信而好古”者。这自然是由于统治者极端专制和极端愚民造成的，而学术界死气沉沉，学术家畏难避祸，以古代史为防空洞、避风港，也是无法辩解和否认的原因。明末清初许多伟大的史学家，在国变之后，毅然决然地都要集中余生精力，就亲身见闻去私编《明史》。 《明史》就是他们的近代史。当时，从学术界老前辈黄宗羲、顾炎武、王夫之到万斯同、全祖望等大史学家，多专心致志私著《明史》，把私著《明史》看作高于一切的神圣任务。黄、万、全等清初史学家在中国史学史上的地位是难以比拟的，因为在二十四史中，只有《史记》敢于写到“今上”即当代史。在明代以前，如后汉初修的《前汉书》，唐初的官修《隋书》，元初的官修《宋史》等，均属隔代修史，而且由于官修，那是根本谈不上史德问题的。在清代以后，如民国初年以清朝遗老为主官修的《清史稿》，等于清王朝的奴才为清王朝的主子服务，也是可鄙的。只有明清间的一大群史学家敢于不惜牺牲、无所畏惧地私著信史实录，确为难能可贵，这是中国史学史上最值得大书特书的一点。这也可见史学是以同现实有密切关系的近现代历史为中心的，历史科学工作者必须是大智大勇者，缺乏勇敢精神，就不可能成为伟大的历史学家。 下列对文段内容理解正确的一项是( )。
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