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  3. What are the symptoms of SBS? What is the main idea of the passage?

What are the symptoms of SBS? What is the main idea of the passage?

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问题 What are the symptoms of SBS?
What is the main idea of the passage?
选项 A、SBS now occurs and we’d better pay much attention to it.
B、SBS shares symptoms with many prevalent maladies.
C、Biological contaminants can cause a more persistent form of SBS.
D、The classic case of chemical SBS occurred at EPA headquarters.
答案A
解析 这句话中SBS在文中出现并予以发展我们也很少对此重视。所以这里的正确选择就是A。
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