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译林版模块九 Module IX Communicating with other cultures《Unit 2 Witnessing time Self-assessment》优秀教学课件
Buildings and streets are covered in smog in Beijing, capital of China.
Step 1
Self-exploration
smog
definition
causes
ralated
experiences
harm
measurement
---
solution
Show time
Present your result of discussion.
Step 2
summary
Definition:
smog is air pollution in which is mixed up with dust， smoke and other dry particles(颗粒) ，and it obscure（掩盖） the clarity（明净） of the sky and interacts with（与---相互作用） the natural environment.
Measurement 计算方式
AQI（air quality index）
空气质量指数
API(air pollution index)
空气污染指数
PM2.5