依法对期货从业人员实行自律管理，负责从业资格的认定、管理及撤销的机构是（）。

A.中国证监会

B.中国期货业协会

C.期货保证金安全管理机构

D.期货交易所

MIDI enables people to use （66） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （67） ", the Hardware interface and a distribution （68） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （69） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （70） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

70（）

A．messages

B．packets

C． frame

D．information