【答案】 shopping carts
【解析】词义猜测题。由上句----a part of his or her life behind a shopping cart（购物手推车）可以得出谈的是.购物手推车。
2. What was the purpose of Goldman’s invention? （No more than 10 words）
【答案】It was to make shopping easier and attract more business.
【解析】细节理解表达。由二段的Every day he would see shoppers lugging（吃力地携带） groceries和第三段可知他做购物手推车的目的。
