单项选择题

Where does the conversation probably take place

A．In a friend’s house.
B．In a shop.
C．At a party.
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单项选择题
Which of the following is not true according to the passage.
A．SamuelF.
B．Morse invented not only the electric telegraph but also telegraph code.B. The Morse code can be used for communication by telegraph cable or radio.
C．The Morse code is the only telegraphic code in world.
D．When the ships are on the sea, radio operators often use the Morse code.
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
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