单选题Spring tides occur().Aat the start of spring,when the Sun is nearly over the equatorBonly when the Sun and Moon are on the same side of the Earth and nearly in lineCwhen the Sun and Moon are at approximately 90°to each other as seen from the EarthDwhen the Sun,Moon,and Earth are nearly in line,in any order
单选题
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
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