单项选择题

The September 11 terrorist attack is an example of______.

A．the creative side of systems theory
B．the destructive side of systems theory
C．the organizational side of systems theory
D．the sensational side of systems theory

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单项选择题

What is the main idea of the passage

A．All events are full of opportunities for learning.
B．We can enhance our future security by learning more about our society's complexities.
C．The September 11 terrorist attack is the most destructive disaster of all.
D．Terrorism poses a formidable threat to international security.