阅读理解。

      My name is Helen. I'm seven. Dale is my brother. He's eleven. We are in the same

(相同的) school. My mother is a teacher. She teaches English. She is a teacher in our

school. My father is a doctor in a big hospital. I have a dog. Its name is Ben. We are

good friends.

1. Dale and Helen are ______.

A. brother and sister

B. friends

C. students

D. both A and C

2. Dale's mother is ______.

A. an English teacher

B. a doctor

C. a student

D. eleven

3. Ben is the name of ______.

A. Dale's sister

B. Helen's dog

C. Helen's mother

D. Dale's father

4. Helen is ______.

A. an English teacher

B. a doctor

C. a student

D. eleven

5. Dale, Helen and their mother are ______.

A. students

B. at home

C. friends

D in the same school

服用磺胺时，同服小苏打的目的是

A．增强抗菌活性

B．扩大抗菌谱

C．促进磺胺的吸收

D．延缓磺胺药的排泄

E．减少不良反应