问题
单项选择题
The color of the signal flare sent up by a submarine about to surface due to an emergency condition within the submarine is（）.
A.green
B.red
C.white
D.yellow
答案
参考答案：B
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The color of the signal flare sent up by a submarine about to surface due to an emergency condition within the submarine is（）.
A.green
B.red
C.white
D.yellow
参考答案：B