们能学到如何在运动后恢复精力23.A细节理解题。根据“ Breathwork by Valerie Moselle”部分前两句“ Deep breathing is one of the mosteffective ways to calm your mind and increase the flow of blood and oxygen throughout your body. ValerieMoselle leads readers through a three- week practical program that includes a range of breathing techniques可知,深呼吸是静心的最有效的方法之一,本书介绍了许多深呼吸技巧,故这本书符合题干中提出的“abook to learn how to calm down”这一要求。根据该部分第二行“ Paperback:$11.19”可得知