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Why do people get headaches in a crowded, stuffy room? Because they are breathing bad air. People who breathe bad air for a long time can get really sick. They may even get lung cancer and die. People
This Scientific Americans podcast is sponsored by audible.com, the number-one online resource for best-selling audio books and more. And now audible.com is offering Scientific American listeners a free audio book of your choice. For details go to aud
> 29 大城市对周围农村农作物生长的影响 DATE=5-29-01 TITLE=AGRICULTURE REPORT - Pollution and Crops BYLINE=Jill Moss (Start at 59
BEIJING, Jan. 29 (Xinhua) -- Thirty percent of official cars in Beijing should not be used when there is extremely bad pollution, traffic authorities confirmed Tuesday. The order was implemented on Monday evening to help combat the fourth round of he
BEIJING, Jan. 19 (Xinhua) -- The number of vehicles on Beijing's roads could be cut on days when the city suffers from heavy air pollution, according to a new regulation released for comments on Saturday. According to the Beijing Municipal Air Pollut
LESSON 51 Metals 第五十一课 金属 Metals are seldom found in a pure state. 金属很少以纯物质状态被发现, They are generally found mixed with earth, stones, or other metals, from which they are separated by washing, crushing, or bur