填空题

The writer mainly explores the causes of increasing numbers of brownfields iii this article.

【参考答案】

N
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社会实践的作用2. 可能产生的问题3. 提出建议 Social Practice
单项选择题
What does the author mean by saying learning that you are (Line 2, Para. 1)
A．Learning what disease you've caught.
B．Learning that you are infected.
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