MIDI enables people to use (61) computers and electronic musical instruments. There are actually three components to M1DI, the communications " (62) ", the Hardware Interface and a distribution (63) called "Standard MIDI Files". In the context of the WWW, the most interesting component is the (64) Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol (65) are stored in MID! 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.

A．Video

B．Faxmail

C．Graphic

D．Audio

基础代谢能量测定是指（）。

A.活动后4小时测得机体所需的维持生命活动最低能量需要量

B.处于清醒、空腹、安静状态下机体所需维持体温和生命活动的最低能量需要量

C.机体处于清醒、饭后2小时、活动2小时后测得机体所需的维持生命活动最低能量需要量

D.机体维持生命活动最基本的能量