在铝液焙烧法、焦粒焙烧法、燃气焙烧法中，能量利用率最高的是（）。
A、铝液焙烧法
B、焦粒焙烧法
C、燃气焙烧法
D、无法比较
参考答案：C
The 29th Olympic Games, _____ in Beijing in 2008, was a great success. [ ]
A. to play
B. played
C. playing
D. to be played
无效腔
