单项选择题

The passage mainly tells us ________.

A．how to send messages
B．what the Morse code is and how it is widely used
C．the Morse code is used telegraphic code
D．how Morse invented the telegraphic code

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单项选择题

From the passage we can infer _________.

A．Marianne Adam has had many photographs printed in magazines
B．Joseph Saimders has worked in New Urban ,University for over 12 years
C．Dr John Goode's method of stopping smoking is successful
D．many business education teachers have given successful lessons in typing before

单项选择题

The word professional in this advertisement most probably means “_______.”

A．spiritual
B．journalist
C．professor
D．experienced