新速腾多功能方向盘右侧按键中都包含哪些功能按键（）。
A.语音识别
B.电话接通/挂断
C.收音机调频
D.菜单选择按键
参考答案：A, B, C, D
Mary, _____ for her healthy lifestyle, was pictured on the front cover of Life Style magazine. [ ]
A. knowing
B. to know
C. known
D. being known
在标准状况下，O2和CO2的混合气体共6.72L，其质量为11.4g，则混合气体中氧气的质量分数是 （ ）
A．21%
B．78%
C．50%
D．42.1%
