题目

下列每句中只有一处错误，每处错误仅涉及一个单词的增加、删除或修改．增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词．删除：把多余的词用斜线（\）划掉．修改：在错的词下划一横线，并在该词下面写出修改后的词．【1】Select a mobile phone for personal use is no easy task because technology is changing so rapidly．【2】There is some doubt among doctors that the medicine will have an effect on the patients．【3】The famous musician as well as his students who were also excellent sin汉代形成的“丝绸之路”促进了中外经济文化交流。若当时一位外国商人来中国采购商品，他可能购买到的商品有(　　) ①丝绸　②纸张　③瓷器　④棉布 A．①②④          B．①③④    C．②③④           D．①②③