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阅读短文，根据所读内容在文章后表格中的空格里填入一个最恰当的单词。Left foot, right foot, left foot, right foot…you can travel fast or slow. The movement of your feet gets you where you need to go. But it also gets you so much more! Walking is such basic, simple exercise that almost everyone can take part in it.Walking helps you in many ways. First, it makes your heart stronger. Studies show regular walking lowers your chance of heart disease. Walking for 30 minutes per day also helps control blood pressure. It can reduce your chance of having a stroke or deve我国政府为把2008年的北京奥运会办成绿色奥运，目前正在北京地区实施大规模的绿化工程。绿化北京的根本目的是为了调节(    ) A．北京地区的气温 B．北京地区的湿度 C．北京地区氧气和二氧化碳的浓度 D．北京地区氧气和二氧化硫的浓度