15.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

16.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

17.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

18.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

19.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

20.Section I Use of English 　　In winter, people might lessen their outdoor exercise. The days get dark1, and it can be very cold! These conditions can make it harder for some of us to get2for exercise. 　　3, cold days can be perfect for outdoor workouts! There are at least three important health benefits4cold-weather workouts, and you should get some knowledge of these before going out. 　　1. The body works harder in cold weather. 　　Health experts at the Medical University of South Carolina say the body must5extra energy to keep warm in low temperatures. This means the body is6more calories and fat. 　　Your lungs also may7better in cold weather. Researchers at Northern Arizona University in Flagstaff found some interesting results in a study of goats. Yes, I said "goats." But8, their results were pretty interesting. 　　The scientists looked at how cold-weather activity9goats. They found that "during the three coldest months, the10but cold-exposed goats experienced a 34% increase in11oxygen uptake and a 29% increase in running speed." When temperatures increased in the spring both oxygen uptake and running speed of the goats12. 　　2. Regular cold-weather exercising may help the immune system. 　　The winter season is also cold and flu season. Making outdoor exercise a usual part of your workout may help you13both colds and the flu. It may strengthen your body’s14system. The Mayo Foundation for Medical Education and Research found that winter workouts can15your risk of getting the flu by 20 to 30 percent. 　　3. Exercising outdoors in cold weather may help your mental health. 　　Some people who16"winter blues" or Seasonal Affective Disorder, may17going outside to exercise in the fresh air and sunshine. 　　An outdoor workout increases exposure18sunlight. Sunlight helps the body produce vitamin D. And vitamin D produces hormones that19your mood. 　　20, there are several health benefits of exercising outdoors in very cold weather. Give yourselves a chance to enjoy this fantastic moment!

21.Virtual reality, according to the text, is ______.

22.About some applications of VR, which statement is INCORRECT?

23.It can be inferred from the text that VR may ______

24.The author reveals ______ concerning the future of VR.