9．As we all know，there are four important inventionsin ancient China．

分析 眾所周知，中國古代有四大發(fā)明．

解答 答案：inventions
根據(jù)句意以及首字母的提示可知，空缺處的意思是：（四大）發(fā)明；由于invention（發(fā)明）是可數(shù)名詞，故填復(fù)數(shù)名詞inventions．

點(diǎn)評 做類似的題時(shí)，首先應(yīng)根據(jù)句意以及首字母的提示判斷出空缺處的意思；其次從語法分析的角度，確定出應(yīng)填單詞的形式；因此在平時(shí)的學(xué)習(xí)中，除了應(yīng)牢固記憶單詞的拼寫之外，還要熟練掌握一些的語法知識．

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