阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写 1 个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。
The Longji Rice Terraces ( 龙脊梯田 ) were built by the local Zhuang and Yao people, to whom Guangxi is home. Starting in the Yuan Dynasty, work on the terraces took hundreds of years. The terraces are 1 ． (clever) designed, with hundreds of waterways that connect with each other. During the rainy season, it is along these waterways that rainwater 2 ． (move) down the mountains and into the terraces. These terraces also provide a perfect environment for birds and fish, some of which feed on insects 3 ． can harm the rice crops. Today the Longji Rice Terraces attract thousands of visitors who come to admire this great wonder created by people and nature working together.
1 ． cleverly
2 ． moves
3 ． that/which
【分析】
这是一篇说明文。文章主要简要介绍了龙脊梯田的设计和历史。
1. 考查副词。句意：梯田设计巧妙，数百条水道相互连接。根据下文动词 “designed” 可知设空处应填副词进行修饰。故填 cleverly 。
2. 考查时态。句意：在雨季，雨水沿着这些水道从山上流下，进入梯田。根据分析句子， “rainwater” 为主语，设空处为谓语。根据上文 “is” 及语意，可知此处时态应为一般现在时。主语 rainwater 不可数，谓语用单数形式。故填 moves 。
3. 考查定语从句。句意：这些梯田也为鸟类和鱼类提供了完美的环境，其中一些以危害水稻作物的昆虫为食。根据分析句子，此处应为定语从句。设空处在从句中作主语，且先行词为 insects ，应填 that/which 。故填 that/which 。
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