A、They are expensive to make. B、They are extremely accurate. C、They were first made in space. D、They were invented in the 1970s.

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问题

选项 A、They are expensive to make.
B、They are extremely accurate.
C、They were first made in space.
D、They were invented in the 1970s.

答案B

解析细节辨认题。短文提到，我们现在使用的石英钟和石英表的精确度达到了一年误差不超过一分钟。

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大学英语四级

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A、They are expensive to make. B、They are extremely accurate. C、They were first made in space. D、They were invented in the 1970s.

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