问题
单项选择题
By using MP3，a 600M-byte music CD can be (71) to 50M bytes or less．It can be streamed(downloaded in chunks)so that you can begin listening to the opening bars while the (72) ofthe life arrives in the background。And most important，MP3 music files retain good listening (73) that (74) compression schemes lacked．That (75) of features makes accessing anddistributing music on the Web practical for the first time．
A．addition
B．combination
C．difference
D．condition
答案
参考答案：B
解析：如果使用MP3，600MB的音乐CD能被压缩到50MB或更小。它能流式播放(分块下载)，使你一开始就能听，同时文件其余的(rest)部分在后台继续下载。尤其重要的是，MP3音乐具有较好的音质(quality)，这种音质前期(earlier)压缩方案欠缺。将这些特性结合(combination)起来，使在Web上存取和发布音乐首次得以实现。