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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.

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.

A. obligation               B. observatory                   C. oraganization            D. Laboratory

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.

A. obligation　 B. observatory　 C. oraganization D. laboratory