2. 外语
  3. 　　Next time you enter a username and password, think about the rhythm of your typing. Not only can it be used to identify you, i

　　Next time you enter a username and password, think about the rhythm of your typing. Not only can it be used to identify you, i

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问题 　　Next time you enter a username and password, think about the rhythm of your typing. Not only can it be used to identify you, it can reveal if you are in a stressful environment.
    It has long been known that the rhythms of a person’s typing style are 【C1】 ________ over time, leading to suggestions they could be used to 【C2】 ________ identity or even spot early signs of Alzheimer’s disease. But little was known about the effect of stress on typing 【C3】 ________ , so psychologist Mike Dowman and colleagues at the University of Abertay investigated.
    They asked 35 people to log into a computer 36 times over three 【C4】 ________ sessions up to a month apart, using the same username and password. People were put into 【C5】 ________ and relaxed states alternately (交替地) by listening to a range of sounds known to【C6】 ________ particular emotions.
    The length of time each key was held down and the 【C7】 ________ between one being released and another pressed was recorded to generate a typing "fingerprint" for each person. The team used the data to develop and test software that identifies a person from their typing style【C8】 ________ .
    The data also showed that stress can be 【C9】 ________ in a person’s typing because it changes the pattern of timings.
    "There’s no question: people do type 【C10】 ________ under stress," says Dowman. He suggests that security systems could be designed to raise the alarm if it seems that a person might be being forced to log into a system. More research will be needed, however, before a system could tell if a person is, say, just having a bad day or being held at gunpoint.
    A) stressed            E) interval            I) differently            M) normally
    B) alone               F) verify              J) environments           N) patterns
    C) provoke             G) only                K) detected               O) separate
    D) stable              H) unchangeable        L) complete
【C4】
选项
答案O
解析 此处应为形容词。空后的sessions表示“一段时间”，据下文的the same可捧断此处表示“三段单独的时间”，表明在这三段不同的时间里用同样的用户名和密码，体现实验的合理性。separate符合文意。注意alone作形容词时也有“单独的”之义，但是alone只能作表语形容词，不能作定语修饰名词，故排除。
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大学英语四级

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