2. 外语
  3. Anxiety is a normal response to physical danger, so it is very useful and very popular among people. Now in the United States,

Anxiety is a normal response to physical danger, so it is very useful and very popular among people. Now in the United States,

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问题 Anxiety is a normal response to physical danger, so it is very useful and very popular among people.
Now in the United States, about 19 million people are suffering from mental illness.
选项 A、Y
B、N
C、NG
答案B
解析 定位到文章第三段；此段由一个复合句构成，首先，主句主语是Anxiety disorder，is是系动词，the most common mental illness in the US是表语，表语后是which引导的定语从句。此处which指代the most common mental illness，即anxiety disorder，而不是笼统的精神疾病。理清句子结构是解题关键。
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