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单项选择题

A．When they’re unable to control the person’s behavior.
B．When the causes of the behavior are obvious.
C．When the consequences of the behavior are unpleasant.
D．When the behavior is expected.
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单项选择题A．The airport is closed due to bad weather.B．The flight is following its regular schedule.C．The plane will return to its point of departure.D．An earlier closure affected the airport’s schedule.

A．The airport is closed due to bad weather.
B．The flight is following its regular schedule.
C．The plane will return to its point of departure.
D．An earlier closure affected the airport’s schedule.

单项选择题A．From religious organizations.B．From public sources.C．From corporate sources.D．From research grants.

A．From religious organizations.
B．From public sources.
C．From corporate sources.
D．From research grants.