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18．Astraight（直的）line is the shortest distance between mo points．

分析兩點之間直線距離最短．

解答答案：straight直的，形容詞；句中是修飾名詞line，直接填原形即可．

點評翻譯填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．同時還要注意區分近義短語．

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