单选题Neap tides occur only（）.Aat a new or full MoonBwhen the Sun，Moon，and Earth are in lineCat approximately 28-day intervalsDwhen the Moon is at quadrature
单选题
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
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