5.This produced a chain reaction,which madeitpossible for life to develop.

分析 這產(chǎn)生了連鎖反應(yīng),使得生命的發(fā)展成為可能.

解答 答案是it.本題考查語(yǔ)境中選用恰當(dāng)?shù)脑~或短語(yǔ);題干中考查了短語(yǔ)make it possible for sb.to do sth.使某人做…成為可能,故答案是it.

點(diǎn)評(píng) 單詞填空必須在對(duì)語(yǔ)境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等,同時(shí)注意所選單詞的形式變化.

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