单项选择题

A．Afro-Americans.
B．Juvenile offenders.
C．Caucasians.
D．Hispanics.
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填空题
The need for energy to run machines has steadily increased since the ______________________.
单项选择题
A．it has dropped in numbers.B．it has tripled.C．it has doubled.D．it has become mostly Hispanic.
A．it has dropped in numbers.
B．it has tripled.
C．it has doubled.
D．it has become mostly Hispanic.
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