单项选择题
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
River currents tend to（）.A.Pick up speed where the chan...
单项选择题River currents tend to（）.
A.Pick up speed where the channel widens B.Run slower in the center of the channel C.Hug the inside of a bend D.Cause the greatest depth of water to be along the outside of a bend
Priming of the tides occurs（）.A.at times of new and ful...
单项选择题Priming of the tides occurs（）.
A.at times of new and full Moon B.when the Earth，Moon，and Sun are lying approximately on the same line C.when the Moon is between first quarter and full and between third quarter and new D.when the Moon is between new and first quarter and between full and third quarter
Neap tides occur when the（）.A.Moon is in its first quar...
单项选择题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
