Modem people pay more and more attention to their health. They do exercise, eat 31 31. A. fast B. proper C. sweet D. oily. food,many kinds of vegetables and take part in activities to maintain their physicaland mental health. Many people would like to get advice from doctors, 32 32. A. which B. who C. what D. when makes many doctors and products popular.Fitness trackers bands ( 健康追踪器 ) are among them. A fitness tracker band looks like either a watch or a bracelet( 手镯 ).The band can “ 33 ” 33. A. produce B. forget C. remember D. develop many things about its owner, such as hismovement, diet and situation of 34 . 34. A. sleep B. study C. play D. work Then it will tell him whether his daily life is healthy or not, what he needs to do, what he needs to eat and howhe can sleep well. Some of these bands look cool and are useful to some fashionable people.Some of them can be 35 35. A. stored B. worn C. collected D. protected in any situation—when one is working, traveling,or 36 36. A. only B. just C. even D. mostly whenone is swimming. The 37 37. A. names B. prices C. tasks D. purposes of them are different They can be as low astens of dollars or as high as hundreds of dollars. Many people use the bands to 38 38. A. offer B. show C. lend D. write advice on how to keep themselves healthy. The yexercise, eat and sleep according to the information given by the bands. 39 , 39. A. Because B. So C. And D. However some people think these bands are useless. In their opinion, wise people knowwhat they should do. 40 40. A. Changing B. Learning C. Following D. Refusing the advice of a machine will make them lazy andstupid.