阅读下面材料，将图片所示步骤（A﹣D）与第1﹣5小题相应的文字匹配，并完成第5小题．

    Some experts believe that burpee（立卧撑）is the best exercise in the world because this exercise is

one that anyone can do very easily and extremely cheaply．

    How to perform the basic burpee correctly：

（1）　　keep your back straight， squat（下蹲） down and place your hands on the floor．

（2）　　Begin in a standing position with your back straight and your arms at your sides．

（3）　　Bring your feet back to the squat position by placing your hands on the floor． Then jump

straight up as high as you can after the squat position， holding your arms up directly over your head．

（4）　　Move your feet back behind you， so that you move from a squat position to a full﹣length legextension． Keep both arms and legs straight and strong．

（5）As a form of exercise， the burpee is 　　．

A．difficult and boring

B．useful but difficult

C．simple and inexpensive

D．simple but expensive

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