单项选择题
A proper look-out must be kept（）.
A.only in fog
B.only between the hours of sunset and sunrise
C.only when entering and leaving port
D.at all times
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A head-on situation at night is one in which you see（）.
A.one sidelight of a vessel ahead of you
B.one sidelight and a masthead light of a vessel ahead of you
C.one sidelight，a masthead light，and a range light of a vessel ahead of you
D.both sidelights of a vessel dead ahead of you -
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One of the factors which affects the circulation of ocean currents is（）.
A.humidity
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A.besides
B.excepted
C.otherwise
D.other than
