單項選擇題Neap 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 sides of the Earth and are 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，regardless of alignment order


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1.單項選擇題A wave entering（）is likely to produce bores．

A.shallow water
B.deep water
C.river
D.tide

2.單項選擇題（）is not a type of tide.

A.SEMIDIURNAL
B.DIURNAL
C.MIXED
D.OSCILLATING

3.單項選擇題Water may boil up around the stern of a vessel in a channel due to（）.

A.slack water when upbound
B.shallow water
C.a cross current
D.a head current

4.單項選擇題Tropic tides are caused by the（）.

A.Moon being at its maximum declination
B.Moon crossing the equator
C.Sun and Moon both being near 0°declination
D.Moon being at perigee

5.單項選擇題To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）

A.One hour after the predicted time
B.At the predicted time
C.30 minutes before flood，one hour after an ebb
D.30 minutes before the predicted time