题目内容

1．It'snecessary （必需的）for us to protect our environment．

分析 对我们来说保护环境是有必要的．

解答 答案：necessary．
根据题干It's--（必需的）for us to protect our environment．可知句意为：对我们来说保护环境是有必要的，本题考查It's necessary  for us to do sth．necessary，必要的，形容词．故填：necessary．

点评 本题主要考查翻译填空，做此类题目，首先结合提示词，弄清句意．然后再根据句法，语法，确定单词的准确形式．

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