單項選擇題The Benguela Current flows in a（）.

A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland


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1.單項選擇題Swell is the rise and fall of the ocean’s surface due to（）.

A.fetch
B.distant winds
C.local storms
D.the pull of the moon

2.單項選擇題Stand of the tide is that time when（）.

A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth

3.單項選擇題Spring tides occur（）.

A.when the moon is new or full
B.when the moon and sun have declination of the same name
C.only when the moon and sun are on the same sides of the earth
D.at the beginning of spring when the sun is over the equator

4.單項選擇題Spring tides occur（）.

A.at the start of spring，when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same side of the Earth and nearly in line
C.when the Sun and Moon are at approximately 90°to each other as seen from the Earth
D.when the Sun，Moon，and Earth are nearly in line，in any order

5.單項選擇題Spring tides are tides that（）.

A.have lows lower than normal and highs higher than normal
B.have lows higher than normal and highs lower than normal
C.are unpredictable
D.occur in the spring of the year