Part 4A (第4問A)

Growing food locally in American cities has been getting more popular recently. In fact, the vegetables you buy in the supermarket may be grown just down the street. Shoppers may be surprised, but actually urban farming has deep roots, especially in the northeastern US. Before we had good highways and air transport, fruits and vegetables were often grown in city greenhouses during the winter, instead of being shipped in from faraway states or other countries. Because it reduces transportation costs and provides people with fresh food more quickly, urban farming is making a comeback.