单项选择题

A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.
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单项选择题
A．Why species don’t avoid extinction by adapting.B．Why species become extinct at the rate they do.C．Why humans aren’t extinct.D．How many species aren’t extinct.
A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
单项选择题
A．Those who know how to program computers.B．Those who get special aid from their teachers.C．Those who are very hardworking.D．Those who have well-educated parents.
A．Those who know how to program computers.
B．Those who get special aid from their teachers.
C．Those who are very hardworking.
D．Those who have well-educated parents.
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