2. 外语
  3. The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations.

The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations.

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问题 The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations.
选项 A、unpopular
B、unpredictable
C、unquestionable
D、unprecedented
答案D
解析 unpopular：不流行的；unpredictable：不可预测的；unquestionable：无可非议的；unprecedented：空前的。题中unparalleled意为“空前的”，故可知D选项最符合要求。
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