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Productivity____________________(对于一个国家的繁荣来说起着非常重要的作用)．

【参考答案】

plays a very important role for the prosperity of a nation

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If you know that danger is likely，I suggest that____________________ (你避开它，除非你确信自己能够对付)．

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To our surprise，the pretty little girl____________________(始终助人为乐)．