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职称英语理工类考试考前每日一练 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，并涂在答题卡相应的位置上. Biological Identification Technologies When a person walks.the movement of his head，trunk，hipbones and limbs are all reflected in changes in his body.A computer these changes into a database.Later，the computers can identifv him according to these changes.This is a new hiological identification method and it can quiekly identify an examinee disturbing him.Its especially suitable for use in airports and supermarkets. Everybodys voice is .When a persons voice is recorded by an instrument，its voice frequencY spectrum is called his sound print.Like a fingerprint，everybodys sound print is different.How can computers his sound? First，his voice is recorded，which allows the computers to become familiar with his voice.It will then turn his sound characteristics into a of digits.These digits represent the frequency，pitch and rhythni of the persons voice. These are the on which the computers can distinguish 1 his voice from . When that person needs to be identified.after he says only one word or two，the computers can identify him.The computers can even identifv sounds coming the wires.This will provide a guarantee to electric banks and electric purchases. | 
