Man has known that . We use to work out how far a star is from us.

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问题 Man has known that ______.
We use ______ to work out how far a star is from us.

选项 A、kilometres
B、metres
C、light-years
D、months and years

答案C

解析计算宇宙中天体之间的距离，用光年。

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公共英语二级笔试

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