单项选择题

A．It will allow fewer trees to be cut.
B．It will require less labor costs.
C．It saves some shipping costs.
D．It will make them more competition.
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填空题
The first sentence of the sixth paragraph indicates that it is necessary to __________.
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.
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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