洁净手术室的洁净原理是通过设置（）系统，对空气中的（）和生物粒子均加以控制，以达到一定的洁净标准。
参考答案：净化空调；非生物粒子
句型转换。
1. My house is on Green Street. (就画线部分提问)
________ is _______ house?
2. It's time for lunch. (改同义句)
It's time _______ ________ lunch.
3. Miss Gao is our English teacher. (改同义句)
Miss Gao ________ _______ English.
4. I had a busy weekend . (一般疑问句)
______ you _______ a busy weekend?
5. He is doing his homework now. (用every day 代替now,且改否定句)
He _______ ______ his homework every day.
“用财”之效益在于（）
A.规定政府活动的范围和方向
B.决定政府活动的性质和宗旨
C.正确处理国家、集体和个人之间的关系
D.优化资源配置，集中力量办大事
