Over the past half century.usingchemical fertilizers has become very common in farming．题目和参考答案——青夏教育精英家教网——

题目内容

19．Over the past half century，usingchemical （化学） fertilizers has become very common in farming．

分析在过去的半个世纪里，使用化肥已经成为农耕非常普遍的事情了．

解答答案：chemical．
本空修饰后面的名词fertilizers，可知前面使用形容词chemical来修饰；故答案为chemical．

点评本题需要结合句意及汉语提示，分清所需要填写单词的词性，从而确定答案．

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