题目内容：
How many Americans are likely to suffer panic disorder every year according to NIMH?
A．1，800，000． B．2，500，000
C．Above 2，000，000．
D．Under 2，000，000．
参考答案：
答案解析：
单选题：How many Americans are likely to suffer panic disorder every
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B．2，500，000
C．Above 2，000，000．
D．Under 2，000，000．