单项选择题

What is the direction of rotation of tropical cyclones,tropical storms and hurricanes in the Northern Hemisphere?（）

A.Clockwise and outward
B.Counterclockwise and inward
C.Counterclockwise and outward
D.Clockwise and inward

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单项选择题

A.Good navigational knowledge and a professional job attitude
B.Good computer knowledge
C.Good system knowledge
D.Nothing special

单项选择题

A.uppermost
B.middle
C.bottom
D.aftermost

单项选择题

A.latest
B.update
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D.up-to-date