根据汉语提示完成句子。
—There is an MP5 on the desk,whose is this? —It can be my ____,she bought one yesterday.
—Yes. But it's_______ unusual experience for us. We normally live in a hot place.
朝鲜历史书写着“人类起源于朝鲜半岛”，那么比较有代表性的“曾经流行的人类起源假说”有( )
①非洲说 ②美洲说 ③欧洲说 ④亚洲说
