车站设有（）子系统，向乘客提供各类服务信息，包括车务信息、广告信息等。
参考答案：乘客引导显示
血清中含量最高的Ig是（）
A.IgM
B.IgG
C.IgA
D.IgE
E.IgD
_____ his writing, the writer forgot to have his lunch. [ ]
A. Was absorbed in
B. Absorbed in
C. Absorbed into
D. Was absorbed into
