10．This produced a chain （連鎖） reaction．

分析 這產(chǎn)生了一系列的連鎖反應(yīng)．

解答 答案：chain．
分析句子結(jié)構(gòu)可知，本句考查名詞作定語，修飾reaction，結(jié)合漢語意思可知，答案為chain．

點評 首字母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．同時還要注意提示字母．

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