about 200 years of history=has a history of about 200 history?为什么has a history of about 200 history中同时有of 和about的存在?还是说of和about 要任选其一?

It has about 200 years of history .句中of用在对吗 Peking Opera has (about 200 years )of history.--- ---- ----of history does Peking Opera have. about 200 years of history=has a history of about 200 history?为什么has a history of about 200 history中同时有of 和about的存在?还是说of和about 要任选其一? 英语翻译are themselves made of finer threads — smaller structures about 200 light-years wide and 20,000 light-years long. 首字填空 Australia is also a young country w（） a history of only about 200 years. He is a young man of about 25 years old既然有了about为什么还加of Years of what tape of muice started in the USA about 90 years ago? the history of china is about five thousand years还是 five million.还是five billiom We must make a d_____ about where to hold the end-of-years party He is about seven years old and has a lot of (f )in his hands. 1.Everyone is about 2 years old.2.All of them are about 2 years old.有这2种说法么? China is a country with a h of more than 5,000 years 是at about ten years 还是for about ten years for about three years(提问) 英语,根据首字母提示完句子.1.—How long have you been s —Three and a half years.2.He has been learning English since he was three y old.3.When did you get your first p of skates?4.I want to tell you about my h .5.He is an A . think of youself two years ago write about how you are different now要八年纪水平的 People can live about 70 years old.A． for B． in C． on D of