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            • 1． 短文改错．找出短文中有错误的地方划线并改正，如没有错误请打"√"．
              China has the most bikes in the world． Why are they so popular in China？ (1)
              First， bikes are expensive and most people can afford them． Second， they (2)
              are smart and easy to park． Third， ride bikes doesn"t cause air pollution (3)
              and can save energy． So lots of students ride bike to school． But riding (4)
              bikes can be dangerous， too． So when riding， we should do something (5)
              to protect ourself． For example， we can wear helmets． When we ride (6)
              at night， we can wear light-color clothes． In a word， the most important (7)
              thing is that we must obey the traffic rule and be careful． (8)
              难度：较难
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