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.
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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.
单项选择题
A．Because people saved less.B．Because people were wealthy.C．Because people consumed less.D．Because expenditures on luxuries increased.
A．Because people saved less.
B．Because people were wealthy.
C．Because people consumed less.
D．Because expenditures on luxuries increased.
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