(B)

    Everyone knows that exercise is important．We all need to exercise．Doctors say it is good for us．It makes your heart and body strong．Children who often exercise are more alert(灵活的).That means they do better in tests and schoolwork than those who don't exercise．

    There are many ways to exercise．You can walk，run，swim，skate or play ball games．Make sure you exercise in the following ways：You have to like what you are doing．Exercise enough--but not too much．It's best to exercise twice a week．Thirty minutes each time is enough．Try all kinds of sports until you find one，two or three sports that feel right for you．

    You can exercise at fitness centers．They have a lot of equipment(设备)there．The equipment will help exercise your arm，legs and other parts of your body to make you healthy．Some people buy equipment for their homes．But it's very expensive．Exercising can be fun．Friends can exercise together at fitness center，or they can play sports together．How do you exercise?

依次填入下列各句横线处的成语，最恰当的一组是 （    ）
①在饮水机行业过快发展过程中，监管乏力造成了饮水机市场         的局面，一些伪劣产品严重危害着人们的健康。     
②世界杯期间，大量外国游客涌入巴西，各色人等         ，导致当地犯罪率急剧提高。     
③对于风生水起的互联网金融，刘明康表示，不是每一家都是赢家，目前这个领域           ，谁走的更好，还需拭目以待。

1958年，《人民日报》在评价某运动时载：“农村中每天有近一亿人向自然大进军，热火朝天地进行水利建设；城市中千百万厂矿企业的职工，正在敲响挖掘潜力的锣鼓，一而再、再而三地突破原定的计划指标。”材料表明该运动（    ）