C

    One of the easiest ways to keep fit is to do jogging. Jogging is the name for a very gentle(舒缓的) running-it is just a little faster than walking.

    Start slow joging 20 meters , then walk 20 meters. Little by little , if you are not feeling very tired , you may do more jogging and less walking . Finally , jog the whole way . It will be easy for you to start jogging for 15 minutes twice a week , slowly, increase this to 20—30 minutes every day .The longer you join in jogging , the more you enjoy it and the healthier you will become . Some people like jogging alone , and others enjoy doing it with friends . Jogging in groups makes more people keener(热心的)，because you just can not stay in bed while there is a group of friends waiting outside.

    If you want to start jogging , prepare a pair of comfortable shoes and a determined mind.

被称为“世界屋脊”的地形区是（ ）

在下面①②③处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过10个字。

在人们的衣食住行中，“衣”排在第一位。    ①  ，因为人穿衣不仅仅是为了“蔽寒暑”、防虫防风雨、遮体避羞等，还具有装饰身体、美化生活，显示人的身份地位、民族信仰等作用。因此我国古代服饰成为了民族历史、文化的一个重要载体。  ②  ，为什么我国许多少数民族生活条件很一般，但其民族服饰之精美，令人惊叹。“衣”能排在“衣食住行”之首，  ③    ，就是我国冬季十分严寒，许多贫困古人多为缺衣御寒所苦。“衣”之影响深入到了中国文化和古人生活的方方面面。