阅读理解。

      My name is Peter. I'm fourteen. There are four people in my family. They are my father, my mother, my

brother and I. My mother and father are doctors. My brother and I are at school.

      We have a big house. There is a tall tree in front of the house. My father and mother often sit under the tree

and read books. We sometimes play there.

      My brother and I are in the same school. We like our school very much.

1. How many people are there in Peter's family?[ ]

A. Two.

B. Three.

C. Four.

D. Five.

2. Is there a tree behind their house? [ ]

A. Yes, there is.

B. No, there isn't.

C. Sorry, I don't know.

D. All right.

3. Peter and his brother are _______. [ ]

A. in the school

B. the same age

C. not in the same school

D. teachers

4. What's Peter's parents' (父母的) job? [ ]

A. They are teachers.

B. They are doctors.

C. They are workers.

D. They are students.

5. Peter's parents often _______ under the tree. [ ]

A. walk

B. work

C. read

D. clean

局部排气装置排出的有毒气体，在浓度较高时，应经过（）后，在向大气排放。

A、净化

B、回收

C、净化和回收

D、检验