a. Move towards the equator
b. Move towards the poles
c. Sink down to the bottom of the ocean
d. Rise to the top of the ocean
a. Move towards the equator
b. Move towards the poles
c. Sink down to the bottom of the ocean
d. Rise to the top of the ocean
其实这是个对流问题。冷空气下降,热空气上升。
水里也一样,冷流向下,暖流向上,这是小循环,大循环冷流跟暖流对流,则由极地流向赤道,暖流由赤道流向极地。
所以选a、c。