单项选择题
A. Can I help you C. Safety belt, please. E. Is there anything serious G. What flight are you taking B. We are taking off at last. D. The engine went wrong. F. Just a moment, please. H. It should be OK in an hour.
A．on B．at C．in D．for
A．When language is a barrier, people will find other forms of communication. B．Everybody uses only one form of communication. C．Nonlinguistic language is invaluable to foreigners. D．Although other forms of communication exist, verbalization is the fastest.