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．To be a mathematician.B．To write his own books.C．To teach in high school.D．To be a medical doctor.
A．To be a mathematician.
B．To write his own books.
C．To teach in high school.
D．To be a medical doctor.
单项选择题
A．Bettering his way of life.B．Improving his surroundings.C．Modifying the face of the planet.D．Altering the physical features of the earth.
A．Bettering his way of life.
B．Improving his surroundings.
C．Modifying the face of the planet.
D．Altering the physical features of the earth.
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