Why do athletes often go to high altitudes to train？A．Because they want to increase the am

Why do athletes often go to high altitudes to train？

A．Because they want to increase the amount of haemoglobin in their bodies.

B．Because it may help reduce the amount of red blood cells in their bodies.

C．Because they intend to learn more from the mountain dwellers.

D．Because it can help them to adapt themselves to the high altitude.

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