◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“People think "SOS" is the simplest and common _____to make, in time of danger or disaster. [ ]A. markB. sign C. signal D. remark …”主要考查了你对  【名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。