单项选择题

A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.

A.Tehuan tepecer
B.Papagayo
C.Norther
D.Pampero

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A stretch where the channel changes from one side of the river to the other is called a（）.

A.crossing
B.transit
C.transfer
D.passing

单项选择题

A snag or other underwater obstruction may form a（）.

A.V-shaped ripple with the point of the V pointing upstream
B.V-shaped ripple with the point of the V pointing downstream
C.small patch of smooth water on a windy day
D.smoothing out of the vessel's wake

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A section of the river that is narrower than usual and is often navigable from bank to bank is a（）.

A.chute
B.stabilized channel
C.slough
D.navigable pass