小键人4687802的《Capital's Olympic air the freshest it's been》成绩 - 打字成绩 - 在线打字练习（dazi.91xjr.com）

Capital's Olympic air the freshest it's been in many years The concentration of PM 2.5 air particulates in Beijing hit a record low during the Winter Olympics, officials said. On Feb 4, when the Games...