Last Sunday, I went to the park with my dog, Doudou. Doudou is small. It is white. It has big eyes.We played with a red ball. I threw the ball far. Doudou ran fast to get it. It brought the ball back to me. We laughed a lot. We played for an hour. I felt very happy that day. 

1.1. When did the writer go to the park?

A Last Sunday.

B Last Saturday.

C Today.

D Yesterday.

解析：选A。A细节理解题。根据第一句“Last Sunday, I went to the park with my dog, Doudou”可知，上周日，我和我的狗去了公园。故选A。

2.2. What color is Doudou?

A Black.

B White.

C Brown.

D Yellow.

解析：选B。B细节理解题。根据第三句“It is white”可知，它是白色的。故选B。

3.3. What did the writer and Doudou play with?

A A blue kite.

B A green toy.

C A red ball.

D A black car.

解析：选C。C细节理解题。根据第五句“We played with a red ball”可知，他们玩一个红色的球。故选C。

4.4. What did Doudou do after the writer threw the ball?

A Sat down.

B Ran to get it.

C Slept.

D Ate food.

解析：选B。B细节理解题。根据第七句“Doudou ran fast to get it”可知，豆豆飞快地跑去捡球。故选B。

5.5. The writer felt _______ that day.

A sad

B angry

C bored

D happy

解析：选D。D细节理解题。根据文章最后一句 “I felt very happy that day”可知，那天我感觉很开心。故选D。