单项选择题

Set of current is（）.

A.its velocity in knots
B.direction from which it flows
C.estimated current
D.direction toward which it flows

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单项选择题

A.interruption of the normal current flow by the footing
B.elevating in mud-slide zones
C.penetrating rapidly through a hard crust into weaker soils
D.extracting legs from soils with high cohesion

单项选择题

River currents tend to（）.

A.pick up speed where the channel widens
B.run slower in the center of the channel
C.hug the inside of a bend
D.cause the greatest depth of water to be along the outside of a bend

单项选择题

Priming of the tides occurs（）.

A.at times of new and full Moon
B.when the Earth，Moon，and Sun are lying approximately on the same line
C.when the Moon is between first quarter and full and between third quarter and new
D.when the Moon is between new and first quarter and between full and third quarter