小题1:A
小题2:A
小题3:D
小题4:B
小题1:细节理解题。由第一段第二行People can sell and buy all kinds of products and goods.可知人们借助于bay来交易，选A符合。
小题2:细节理解题。由第二段的第四行In his free time he started Bay as a kind of hobby,可知他是为了娱乐，hobby爱好，故选A.
小题3:句子理解题。借助于上下文，尤其是下句Even in the great. com crashes of the late 1990s,abay has gone from strength to strength ,可知他已经节节胜利，C项和下文意思不吻合，选D符合下文意思。
小题4:细节理解题。由最后一段的第三行Of course for each item （商品）sold eBay gets a percentage and that is great deal of money.可知它是通过提取每件交易的商品1%来赚钱。