单选题 Not so long ago, in many countries, children went to school wearing a school uniform. Boys" wore a white shirt and a tie, a dark jacket, gray pants and black shoes. Girls used to wear a white blouse and a dark, knee - length skirt. Today, in many countries, students have a very different kind of uniform. They wear tennis shoes, jeans, and a T-shirt. On a hot day students might even come to class in a pair of shorts. Teachers in the past would never have allowed these students into their class. Then, the men teachers used to wear a suit and tie, and most women teachers wore a dress or skirt. But when you look inside a classroom today, it is sometimes difficult to tell who are the teachers and who are the students!
People from hot sunny countries often find it difficult to imagine how people who live in a very cold climate can live and work through the winter months. These people manage because they know what to wear in the cold. First, it is very important to keep your head, hands and feet warm. So everyone has a hat, thick gloves to keep their hands warm, and a pair of long socks and heavy boots for their feet . Of course, you should have a heavy overcoat and you should wear a thick wool sweater under it. A scarf around the neck also helps to keep out the cold. What you wear under your clothes is important, too. People who live in cold climates always wear long underwear. Long underwear may not be very comfortable, but it certainly keeps your legs warm!