问题
选择题
People think “SOS” is the simplest and common to make, in time of danger or disaster.
A．mark
B．sign
C．signal
D．remark
答案
答案：C
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People think “SOS” is the simplest and common to make, in time of danger or disaster.
A．mark
B．sign
C．signal
D．remark
答案：C