Today in the US many children are too heavy. This is why gyms( 健身馆 ) for children are getting ____69____. In the gyms, you see weight lifting ( 杠铃 ) for children. You will also see Bikes-children exercise while ___70___ video s. Children like the gym. Clark ___71___ at the gym in the US . It is for children aged 6 to 17. Usually Clark takes a group class first. He does exercise like the hula-hoop( 呼啦圈 ). That takes 45 minutes. Then Clark does his favorite dancing exercise for 15 minutes. “It makes a ___72___from TV and video s. Well, they have video s here too. But they’re ___73___ones.” he said. 69. A. difficult B. easy C. lazy D. popular 70. A. seeing B. watching C. playing D. taking 71. A. plays s B. studies C. watches D. takes lessons 72. A. change B. sport C. question D. information 73. A. different B. difficult C. easy D. interesting