练习题 · EX41M-B-1.3-3我国快递产业发展迅速,2018 年快递件数约为五百零七亿一千万件。把"五百零七亿一千万"写成数字,正确的是( )。A507100000050710000005071000000B507100000005071000000050710000000C507000100005070001000050700010000D500710000000500710000000500710000000题源:北师大版