单选题 The writer's own experience told readers that ______.

A、 they begin to shrink in height and break bones easily as they grow older
B、 they can avoid the writer's troubles if they think over them later in life
C、 they should ask their parents to set the best examples for them
D、 the choices they make now can make a big difference in how they feel later in life

【正确答案】 D

【答案解析】[精解] 文章细节题。文章第二段第一句明确地说："…the choices you make now can make a big difference in how you feel later in life．"，这与选项[D]一致，为正确答案。