单项选择题

According to the passage, the notified students of Columbia University were accused of ______.

A．interrupting a program of speakers
B．refusing to attend a compulsory activity
C．protesting in an improper way breaching the university rules
D．causing a scuffle hurting lots of people from the place other than Columbia

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单项选择题

According to Bisignani's words, We must have a global approach for a global problem , he probably means ______.

A．a better way benefiting the world needs further consideration
B．the problem of air pollution caused by airline industry can't be solved immediately
C．the new regulation of the European Union should be performed globally after 2012
D．the International Civil Aviation Organization should draw up any rules that all countries comply

单项选择题

Which of the following words best describes the tone of the article

A．Indifferent.
B．Sarcastic.
C．Informative.
D．Pessimistic.