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In which month will the equatorial counter current be strongest? （）

A.January
B.April
C.August
D.October

2.單項選擇題In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）

A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing

3.單項選擇題Generally speaking，a ship steaming across the North Pacific from Japan to Seattle is likely to experience（）.

A.adverse currents for practically the entire crossing
B.favorable currents for practically the entire crossing
C.favorable currents in the summer months and adverse currents in the winter months
D.variable currents having no significant effect on the total steaming time

4.單項選擇題Currents are（）in rate and direction.

A.vary
B.variable
C.variably
D.variability

5.單項選擇題Current refers to the（）.

A.vertical movement of the water
B.horizontal movement of the water
C.density changes in the water
D.None of the above