单项选择题

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

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单项选择题
A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.

A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours
单项选择题
A light，feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form，on objects whose temperatures are below freezing，is called（）.

A.dew
B.frost
C.glaze
D.snow
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