Apart from China, what else countries celebrate their National Day on Oct. 01? Nigeria and Tuvalu.

除了中国之外，哪些国家的国庆日是十月一日？尼日利亚和图瓦卢。

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Tuesday was declared a national day of mourning after the tragedy, the worst to hit Nigeria's biggest city for a decade, with flags flying at half mast at government offices across the country.

CNN: Inquiry begins into Nigeria blasts