单项选择题

A．She’s not feeling well.
B．She wants to go home.
C．She wants to stay where she is.
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单项选择题
Certain other combinations are employed to indicate such things as End or Message of Error. means _________.
A．The Morse code can be only sent End of Message or Error
B．It tells us what is the end of Message or Error
C．End of Message or Error can be made up of certain other combinations
D．The Morse code I made up of dots and dashes
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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