触电急救用口对口人工呼吸，正常的吹气频率是（）次／min。
A.12
B.16
C.20
D.30
参考答案：A
I’d try even if I may fail ______sit there worrying in time of trouble.
A．rather than
B．other than
C．more than
D．less than
建筑作品：布达拉宫
