Our body needs taking exercise every day. Daily exercise uses up food and keeps the body strong. It can make your heart work better in order to send enough blood to your muscles. So exercise makes your heart and muscles stronger. Taking exercises also makes you feel good. If you do exercises a few times a week, you will stay healthier and happier you will lose streess after working hours. Most people in big cities do not get enough exercise. They have to work too much for their life, so they don’t have enough time to exercise. They work in office buildings sitting on a chair and in front of computers all day. They may live far from their offices, so they have to drive their cars or catch the bus to work in every early morning. Therefore, when they get home at night, they can’t take exercises because they are too tired. Today, lots of American people are overweight. This causes health problems for them. Doctors say that exercise can help people both lose weight and improve their health. So, many people are trying to get more exercises. But it takes time to change, and when people do not see a difference right away, they lose interest in exercising. 76.The writer says that exercise __________ . A. only makes your muscles strong. B. sends blood to your muscles. C. is only done in a gym. D. makes your heart work hard to send blood to your muscles 77. According to the reading, which fact is NOT true? A. Exercise makes you feel good. B. Some people do not get enough exercise. C. Many people don’t want to get exercise after work because they’re lazy. D. Many people have to drive their cars to work. 78. The writer mentions that in America, __________ . A. many people spend much time driving to work. B. many people are overweight because they don’t get enough exercise. C. most office workers can get a lot of exercise. D. Americans do not like doing exercise. 79. Why don’t the city people get enough exercise? A. They don’t have enough time to exercise. B. They have to drive. C. They are busy with the work. D. A & C are correct. 80. What does the phrase “lose interest” in the passage mean? A. become bored with B. do not find something C. lose weight D. feel tired