美国的空气健康–第 2 级
27-08-2024 15:00
从 1999 年到 2015 年，科学家们一直在研究美国各地的微粒污染浓度。
这些极小的污染颗粒来自工业、发电厂，主要是汽车。它们比人的头发还要小 30 倍，这意味着它们可以深入人体。
研究发现，自 1999 年以来，这类污染有所减少。然而，这种污染造成了约 3 万人死亡。该研究的一位作者说，如果这种污染少一些，对人们是有好处的。
您可以在第 3 层观看原始视频。
该研究的一位作者认为，关于细微物质污染，什么对人们有益？
LEARN 3000 WORDS with CHINESE IN LEVELS
Chinese in Levels is designed to teach you 3000 words in Chinese. Please follow the instructions
below.
How to improve your Chinese with Chinese in Levels:
Reading
- Read two news articles every day.
- Read the news articles from the day before and check if you remember all new words.
Listening
- Listen to the news from today and read the text at the same time.
- Listen to the news from today without reading the text.
Writing
- Answer the question under today’s news and write the answer in the comments.