1, A: The main reason is that he loves running, has rich experience and is strong. The latter two may be shared by other athletes, but the degree of love for running determines the outcome. 2.a: Because he has been in the lead for a long time, his speed has improved and his physique has improved.

A: The future is beautiful and bright.

4. Answer: Happiness is like water, happiness is the tinkling of spring water, and happiness is satisfied with small wishes.

Happiness is inner peace.