句型转换。

1. There are some people in the park. (改为一般疑问句并作否定回答)

    _______ there _______ people in the park?

    No, ______ ______.

2. The post office is on Center Street. (划线部分提问)    

   ______ the post office?

3. He likes pandas. (用giraffes变为选择疑问句)

   ______ he like pandas ______ giraffes?

4. My history teacher speaks English. (划线部分提问)   

   ______ ______ ______ your history teacher speak?

脊髓灰质炎又称____________，病变主要在__________，表现为__________。