17．The river growsbroader（broad ） as it nears the sea．

分析 這條河愈接近海的地方愈寬．

解答 答案：broader
由于此處用在系動詞grow之后作表語，故用形容詞形式；根據(jù)句意可知，此處表示兩者的比較，即將靠近海的地方與不靠近海的地方相比，應使用形容詞的比較級，故用broader．

點評 做本題時，應結(jié)合句意，并從語法分析的角度去判斷句中所填單詞的形式；另外，在平時的學習中，應熟練掌握所學到的詞匯以及各類詞法，句法等語法知識．

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