Forty-three percent of American households have access to the Internet — the perfect observationof the world. The number of Internet-capable homes in US has risen 60 per centover the past year. American users spend on average 5.3 hours a week on-line.Six per cent of on-line Americans are addicts (上瘾的人) who excessively use the Internet, accordingto a survey of 18,000 people by US psychologist David Greenfield.