阅读理解。

     Hi, I'm Anna. This is my grandmother, Kelsey Clark. She is kind (和蔼的). She is 70. She has (有)

 two sons and a daughter. My father is her first son. His name is Mike. He is 42. My mother's name is

 Sally. David is my uncle. Emma is my aunt. My uncle has a son. His name is Jim. He is my cousin. My

  aunt has a daughter and a son. They are Kim and Tony. I like Kim. She is my good friend.

1. Mike Clark is Anna's ______.

    A. son

    B. grandfather

    C. father

    D. cousin

2. Anna's mother is ______.

    A. Emma

    B. Kelsey

    C. Kim

    D. Sally

3. Anna has ______ cousin(s).

    A. one

    B. two

    C. three

    D. four

4. Emma is ______.

    A. Ann's sister  

    B. Sally's daughter

    C. Jim's mother  

    D. Tony's mother

5. Which is TRUE (哪一个是正确的)?

    A. Ann's grandparents are 70.

    B. Anna's uncle's son is Jim.

    C. Anna has a brother and a sister.

    D. Tony and Kim are good friends.

离心泵机械密封的主要密封元件由动环和（）组成。

A、弹性元件

B、辅助密封元件

C、静环

D、填料环