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211. Our daily Beijing Mean Time is in fact Nanjing Time. That’s because we set our time by the stan...
题目内容：
211. Our daily Beijing Mean Time is in fact Nanjing Time. That’s because we set our time by the standards of Tzichingshan (Zijinshan) ______ in Nanjing.
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A．obligation |
B．observatory |
C．oraganization |
D．Laboratory |
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