问题
单项选择题
The purpose of the GMDSS is to（）safety of life and property at sea all over the world.
A.promote
B.improve
C.guarantee
D.both A and B
答案
参考答案：B
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The purpose of the GMDSS is to（）safety of life and property at sea all over the world.
A.promote
B.improve
C.guarantee
D.both A and B
参考答案：B