据媒体报道,我国因环境污染造成的巨大经济损失,每年高达860 000 000元,这个数用科学记数法表示为____元.
The baby stops _______ as soon as he ______ his mother coming into the room.
便于北魏接受汉族思想文化的措施有( )
①均田制 ②迁都 ③尊儒崇经 ④恢复汉族礼乐制度