题目

For the first time in modern history,less than half of the U.S.adult population now reads literature,according to a recent survey.Reading at Risk A Survey of Lilerary Reading in America presents a detailed review of the decline of reading’s role in the nation’s culture. Reading at Risk is a survey of national fashion in adult literary reading.The data souree for Reading at Risk is as reliable and objective(客观的)as any such survey can be.The key results of the survey are presented in the “Surnmary”,but the report can be further exploined as:literary teading in America is not only d宋代商业的繁荣超过了前代，那时商业都市很多，最大的是A．洛阳 开封 B．开封 杭州C．开封 长安 D．洛阳 杭州