问题
单项选择题
A message warning of a tropical storm should be sent as a(n)（）.
A.routine message
B.urgent message
C.distress message
D.safety message
答案
参考答案：D
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A message warning of a tropical storm should be sent as a(n)（）.
A.routine message
B.urgent message
C.distress message
D.safety message
参考答案：D