单项选择题
As a duty sailor, he should （）.
A. keep a gangway watch
B. often look around the ship
C. hoist and lower national flag on time
D. A+B+C
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The gangway is one meter higher,（） it, please.
A.lowing
B.lower
C.low
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The gangway is one meter lower, （）it please.
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单项选择题
（）the gangway, please.
A.Lower
B.Higher
C.Lowered
D.High
