（ ）较早于1993年发布了《自然旅游业者的生态旅游规范》，又于1995年出版了《生态旅游规范大全》一书。
A. 国际生态旅游协会
B. 世界旅行旅游理事会
C. “绿色环球21”组织
D. 世界自然保护同盟
查看答案
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”。
A. 对
B. 错
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.
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