Leiper（1979）提出的旅游系统包括下列地理要素：
A. 旅游者
B. 旅游客源地
C. 旅游通道
D. 旅游目的地
E. 旅游业
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旅游环境容量包括（）4个方面。
A. 旅游生态环境容量
B. 旅游感知容量
C. 旅游社会环境容量
D. 旅游经济环境容量
E. 旅游心理感觉容量
环境问题已成为旅游开发与管理的“核心问题”之一。
A. 对
B. 错
We are sure that the environment in our city _______ greatly through our work in the near future.
A. improved
B. was improve
C. has improved
D. will be improved
The pet dog is warm and loving. It ______ as a daughter of my family.
A. treats
B. treated
C. is treated
D. was treated
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