阅读短文，判断对(√)错(×)。

      I have a happy family. My father is a police officer. His name is Bob. He is tall and handsome. My mother

is a doctor. Her name is Mary Smith. She is short and beautiful. I am a student. I am ten years old. I'm a pretty

girl. I love my family.

( ) 1. My father is a doctor.

( ) 2. My father is tall and handsome.

( ) 3. My mother is a police officer.

( ) 4. My mother is short and beautiful.

( ) 5. I am a boy.

下列哪种情况不需要术前安装起搏器（）。

A.完全性房室传导阻滞

B.心率低于40次／分

C.停搏期≥0.3s

D.病窦综合征

E.预激综合征