同义句转换。

1. We use words and body language to express our thoughts and opinions.

    We express _____ _____ _____ words and body language.

2. He folded his arms in front of his chest and stood next to his daughter.

    He stood next to his daughter _____ his arms _____ in front of his chest.

3. Looking into someone's eyes is a way to show that one is interested.

    _____ _____ _____ is a way to show that one is in- terested.

4. In Russia, a visiting friend is often greeted with a kiss on the cheek.

    In Russia, a friend who comes _____ _____ _____ is often greeted with a kiss on the cheek.

5. I'd like to take a rest. I am too tired to walk further.

    I _____ _____ _____ a rest. I am too tired to walk further.

手术室净化空调室内应保持：（）

A、正压

B、负压

C、常压

D、无压