问题
单项选择题
Ships at sea are in urgent need of MSI because they are（）various kinds of danger.
A.subject for
B.liable to
C.easy to meet
D.always encounter
答案
参考答案：C
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Ships at sea are in urgent need of MSI because they are（）various kinds of danger.
A.subject for
B.liable to
C.easy to meet
D.always encounter
参考答案：C