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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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