单选题
"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
【正确答案】
C
【答案解析】
[解析] 本题考查对文章中语句的理解，只要将该句意思弄明白了，即使不读文章也不难判断出选项C正确。
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