阅读理解。

     Mr Brown was an old man. He lived in a small village with high mountains all around it. He had never

been to a city before.

     Last summer his son came back, and took him to the city. He stayed there for about two months. When

he came back, his wife asked him, "Do you like living in the city? Did you have a good time?"

     "No, I don't like living in the city because the buildings are too tall. And the noise is too loud. The bed is

too soft. And they never have meals outside the house," answered Mr brown. "I'm very angry because the

people in the city aren't kind to the animals."

     "How do you know this?" asked his wife.

     "One Sunday morning Jack, our son took me to a place. There are a lot of animals in that place-tigers,

elephants, lions and monkeys. But they are shut (关) in the cages. The place is the prison (监狱) of the

animals." Answered Mr Brown..

1. Mr and Mrs Brown were ______.[ ]

A. doctors

B. teachers

C. zookeepers

D. farmers

2. When Mr Brown saw the animals were shut in the cages he felt ______.[ ]

A. satisfied (满意的)

B. angry

C. happy

D. surprised

3. He didn't like ______. [ ]

A. the mountains

B. the animals in the cages

C. the city

D. his village.

4. The animals in Mr Brown's village ______. [ ]

A. are free

B. are in the cages

C. are sent to the city

D. are in prison

5. Mr Brown did not know the place with a lot of animals was a ______. [ ]

A. park

B. garden

C. village

D. zoo

有机物A（C₆H₈O₄）为食品包装袋内的常用防腐剂。A中以使溴水褪色，A难溶于水，但在酸性条件下可发生水解反应，得到B（C₄H₄O₄）和甲醇。通常状态下B为无色晶体，能与氢氧化钠溶液发生反应。

（1）B分子所含官能团的名称是___________________________________________________。

（2）B分子中没有支链，其结构简式是_____________________________________________。

（3）A的结构简式是_____________________________________________________________。

（4）天门冬氨酸（C₄H₇NO₄）是组成人体蛋白质的氨基酸之一，可由B通过以下反应制取：

BC天门冬氨酸

天门冬氨酸的结构简式是________________________________________________________。