【正确答案】 Online shopping is a form of electronic commerce which allows consumers to purchase goods or services through the Internet by clicking a mouse without stepping out of their houses. High-quality online goods at fair prices attract an increasing number of customers. Meanwhile, online shopping can be conducted anywhere at any time, so it's very convenient and quite caters for the young generation. It is predicted that in the future the number of online shoppers will keep growing at a faster rate in China. But the rapid growth of online shopping presents a lot of problems for the express service. To deliver the massive amount of items ordered online to the customers on time, many couriers have to work day and night.