单选题：Which of the following is true about the research carried ou

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following is true about the research carried out by the US Army? A．It has changed our life.
B．It has not succeeded yet.
C．It has cost a large sum of money.
D．It has improved the abilities of tanks.

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