Yu Zidi is a great swimmer. She started swimming at age six. One hot summer, she went to a water park with her father. She loved playing in the water. Later, a coach named Li Chao found her there. He found Yu had a good feeling for water. So he asked her to join the swimming team. There Yu trained (训练) with bigger kids after school. After four years of training, she became a great swimmer in China.

1.1.Yu Zidi started swimming at age ________.

A 4

B 6

C 8

D 10

解析：选B。B 细节理解题。根据文章第二句“She started swimming at age six”可知，于子迪6岁开始游泳。故选B。

2.2.Who took Yu to the water park?

A Her mom.

B Her dad.

C Her coach.

D Her friend.

解析：选B。B 细节理解题。根据文章第三句“she went to a water park with her father” 可知，是爸爸带她去的水上乐园。故选 B。

3.3.Li Chao is ________.

A a cook

B a doctor

C a driver

D a coach

解析：选D。D 细节理解题。根据文章第五句“Later, a coach named Li Chao found her there.”可知，李超是一名教练。故选D。

4.4.When did Yu train with bigger kids?

A After school.

B In the summer.

C In the morning.

D At noon.

解析：选A。A 细节理解题。根据文章倒数第二句“There Yu trained with bigger kids after school. ”可知，于子迪每天放学后就去和年龄较大的孩子一起训练。故选A。