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11．The Yangtze River is the thirdlongest （long） river．

分析長江是第三長的河流．

解答答案：longest；固定用法，the+序數詞+形容詞最高級，表示第…的…，根據句意長江是第三長的河流，故填longest．

點評單詞填空題，考生注意詞語固定用法和語境，填寫所給單詞的適當形式．

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