填空题

Individuals always overgrazed "the common land" because their own lands are not fertile enough.

【参考答案】

N

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填空题

This passage mainly concerns environmental problems including ozone, garbage disposal, global warming, renewable resources, and nuclear issues.

问答题

学生往往对社会实践缺少认识2. 社会实践是学校教育的一个重要组成部分3. 参加社会实践的好处