亚洲免费乱码视频,日韩 欧美 国产 动漫 一区,97在线观看免费视频播国产,中文字幕亚洲图片

      1. <legend id="ppnor"></legend>

      2. 
        
        <sup id="ppnor"><input id="ppnor"></input></sup>
        <s id="ppnor"></s>

        星火:2008年12月英語四級考試預測試卷17

        字號:

        Passage Three
            The computer virus is an outcome of the computer overgrowth in the 1980s. (32)The cause of the term “computer virus” is the likeness between the biological virus and the evil program infected with computers. The origin of this term came from an American science fiction “The Adolescence of P-1” written by Thomas J. Ryan, published in 1977. Human viruses invade a living cell and turn it into a factory for manufacturing viruses. However, (33)computer viruses are small programs. They expand by attaching a copy of themselves to another program. Once attached to the host program, the viruses then look for other programs to “infect”. In this way, the virus can spread quickly throughout a hard disk or an entire organization when it infects a LAN or a multiuser system. The timing of the attack can be linked to a number of situations, including a certain time or date, the presence of a particular file, the security level of the user, and the number of times a file is used. Likewise, the mode of attack varies. (34)So called “benign” or the harmless viruses might simply display a message, like the one that infected IBM’s main computer system last Christmas with a season’s greeting. (35)Malignant or the harmful viruses are designed to damage the system. The attack is to wipe out data, to delete files, or to format the hard disk.
            32. How did the name of “computer virus” come into being?
            A)。通過預讀選項可知,本題與電腦病毒有關。應遵循短文聽力聽首尾的原則,文章一開始就明確了說明對象是computer virus。本題考查該名稱的由來,但文中是以原因的形式出現(xiàn)的:The cause of the term “computer virus” is the likeness between the biological virus and the evil program infected with computers,A)的說法正是該定義的簡短描述。其中,resemble是“…與…相似的”意思,而文中的說法是the likeness between…and…,二者是一致的。
            33. What is the way that the computer viruses infect the computer systems?
            B)。分析選項可知,本題考查電腦病毒的工作方式。由于其特殊性,可遵循“聽到即是解”的原則解題。文章先介紹了人類病毒的工作方式,然后用一個however引出了本題的答案:computer viruses are small programs. They expand by attaching a copy of themselves to another program。
            34. What is a “benign” virus?
            D)。預讀選項可知,本題與一種電腦病毒有關。題目中的benign是關鍵詞,由此可以很容易定位到:So called “benign” or the harmless viruses might simply display a message…,可見本題的答案是以同位語的形式出現(xiàn)的,所謂“良性”病毒就是D)所說的不會造成危害的病毒。
            35. What can a “malignant” virus do to your computer?
            B)。預讀選項可知,本題仍然與一種電腦病毒有關。由于上一道題目考查了“良性”病毒,根據(jù)常識可以推斷本題定然會考查與之相對應的“惡性”病毒的危害。聽錄音時的關鍵詞是malignant,由此可以很容易定位到:Malignant or the harmful viruses are designed to damage the system,這正是B)的同義表達。