在自然界中存在着氧的循环系统，其中能将二氧化碳转化为氧气的是(  )

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     There is a saying, “No sports, no life.” Sports are very important to us. Sports help us to stay  1  and get good grades. Everyone in our class   2  sports. Our favourite  3  is PE. We only have PE lessons  4  a week, but we play sports every day. The most popular sport in our class is basketball. The boys enjoy  5  it, and many of the  6  like it, too. Another popular sport is football and there   7  a lot of football fans (球迷) in ourclass. When the weather is 8 , we often play ping-pong outside.We hardly ever (几乎不) play volleyball. We think it's  9. We have a basketball team. Our team often has friendship (友谊) matches (比赛) with teams from other schools. When there is a match, many of us go to  10  it. It's very interesting.

唐陈廷章《水轮赋》：“水能利物，轮乃曲成。升降满农大之用，低徊随匠氏之程。始崩腾以电散，俄宛转以风生。虽破浪丁。川湄，善行无迹；既斡流丁波面，终夜有声。”他描绘的是唐代的一种灌溉工具（见图），被称为（    ）

中国“九球天后”潘晓婷给自己的2011赛季打了零分，她说：“去年的状态一般，主要是没有太多的时间练球。”潘晓婷是通过       来认识自己的。（    ）

宋朝时期政府管理海外贸易的机构是（    ）