1999年原国家旅游局等四部门联合举办了“99中国生态环境游”活动，其主题是“走向自然、认识自然、保护环境”。
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Three News reports. Questions 1 to 3 are based on the passages you have just heard.[音频]
A. Countries exposed to serious air pollution.
B. The effects of air pollution on intelligence.
C. Tendency of people’s learning performance.
Different learning performance among cities.
Listen to the recording
A. Through the samples’ performance on tests.
B. Through interviews of large sample population.
C. Through the data provided by the government.
D. Through the analysis of corresponding literature.
Listen to the recording
A. It is related to 91 percent of mental illnesses.
B. It ranks as the fourth biggest cause of death.
C. It causes more harm to teens than older people.
D. It causes more harm to people living in the city.
Questions 4 to 6 are based on the passages you have just heard.
A. The combat against environmental pollution.
B. Problems caused by artificial lights.
C. Technical improvements of LED lights.
D. The importance of darkness to the ecosystem.
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