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16．Cutting down all the trees is harmfulto the environment．

分析砍伐所有的樹木對環境是有害的．

解答答案：harmful
根據空格前為系動詞is，空格后為介詞to，結合語境及首字母h可知砍伐樹木對環境有害，be harmful to 意為"對…有害的"故填入形容詞harmful"有害的"，故答案為harmful

點評根據首字母填詞要善于體會上下句的邏輯聯系，而且要有扎實的語言知識儲備和較大的詞匯量

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