单项选择题
A．who are to evaluate teachers’ lecturing B．how to promote teachers C．how to give lectures in classes D．how to help improve teachers’ lecturing techniques
A．Picture signs. B．Braille. C．Body language. D．Signal flags.
A．There are many forms of communication in existence today. B．Language is the most common form of communication. C．Tourists are incapable of using an oral form of communication. D．Ideas and thoughts can be transmitted by body languag