单项选择题

Why does the author give the example of the terrorist attack on Sept.11

A．To prove that human is at risk.
B．To demonstrate that mankind is more nervous than any other time.
C．To show that anxiety seldom reoccurs.
D．To indicate that anxiety is easy to arouse.

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单项选择题

What can be the most suitable title of this passage

A．The Origin of Anxiety.
B．The Hazards of Anxiety.
C．Healing Anxiety.
D．Understanding Anxiety.

单项选择题

Which of the following statement is NOT true according to the passage

A．Anxiety is supposed to be avoided.
B．What leads to anxiety can be ambiguous.
C．Anxiety disorder has a negative impact.
D．Anxiety is one of the health-care issues.