五世纪等于多少年求答案

　　About the mid-fifth century,three Germanic tribes:Angles (Angles),Saxon (Saxons) and the Jutes (Juries) invaded Britain.Historically known as the Anglo-Saxon conquest (the Anglo-Saxon conquest).These invaders brought their own dialects,with the gradual integration of these dialects,as Old English (Old English).To the sixth century the British original inhabitants --- Celtics (Celts) or kill,or drive into the mountains,or reduced to slavery.Invaders became a British master,Old English or Anglo Saxon said (Anglo-Saxon) language of the UK,only in some of the Celtic place names in the United Kingdom,into the English language very few Celtic words.Therefore,we can say,with the Anglo-Saxon conquest of Britain,really the birth of the English language.
　　Old English period there were four main dialects:① dialect of Northern Calabria - - Hung
　　Po River north of the dialect; ② dialect --- Mel ranges from Hongbo West River and the River Thames in central England between the dialects; ③ living in Kent,southeast England dialect --- Jutes dialect region; ④ --- West Saxon dialect of the south of the River Thames.Northumbria and West Asia,the two dialects and Mel together Anglia (Anglian) dialect,that is,areas inhabited by the Anglo dialects,the early Old English dialect of Northumbria literature is created.

就是精确到千分位，根据圆周率π的近似值在3.1415926与3.1415927之间，可得结果．
∵圆周率π的近似值在3.1415926与3.1415927之间，
∴π≈3.142．
故答案为：3.142．

A、它精确到千分位的值是3.142，故本选项错误；
B、它的近似值3.14精确到百分位，故本选项错误；
C、它的近似值3.1416有5个有效数字，故本选项错误；
D、它保留3个有效数字的近似值为3.14，故本选项正确；
故选D．

古英语很不同于我们今天所讲的英语.古英语组成了他们语言的混合,这就是因为英语有很多来自于不同语言的词以及短语.
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