18．This original telegraph sent a message over distances using Morse code （a series of dotstapped（輕敲） out along a wire in a particular order）．

分析 這種原始的電報是在一段距離中用莫爾斯電碼傳遞信息（莫爾斯電碼是通過電線發(fā)出的以特定的次序敲擊出的一連串點(diǎn)）．

解答 答案是tapped．本題考查語境中選用恰當(dāng)?shù)脑~或短語；tap v．輕敲；題干中需要的是dot的定語，tap和dot之間是被動關(guān)系，故用過去分詞，答案是tapped．

點(diǎn)評 翻譯填空要在理解句子的結(jié)構(gòu)和含義的基礎(chǔ)上根據(jù)漢語意思選擇恰當(dāng)?shù)脑~、短語或句型；同時注意所選詞的形式變化．

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