英语数字6,500,431,729读成____________.
| A.six billion ,five hundred million, four hundred and thirty-one thousand, seven hundred and twenty –nine. |
| B.six thousand and five hundred million, four hundred and thirty-one thousand, seven hundred and twenty –nine. |
| C.six billion ,five hundred million, four thousand, three hundred and seventeen hundred and twenty –nine. |
| D.six thousand and five hundred billion four hundred and thirty-one thousand, seven hundred and twenty –nine. |