單項(xiàng)選擇題Neap tides occur when the（）.

A.Moon is in its first quarter and third quarter phases
B.Sun and Moon are on opposite sides of the Earth
C.Moon's declination is maximum and opposite to that of the Sun
D.Sun and Moon are in conjunction


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1.單項(xiàng)選擇題Neap tides occur only（）.

A.at a new or full Moon
B.when the Sun，Moon，and Earth are in line
C.at approximately 28-day intervals
D.when the Moon is at quadrature

2.單項(xiàng)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

3.單項(xiàng)選擇題A wave entering（）is likely to produce bores．

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

4.單項(xiàng)選擇題（）is not a type of tide.

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

5.單項(xiàng)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