单项选择题

A．The advanced equipment in the laboratory.
B．The so-early start-working hour.
C．The terrible working habit of his colleagues.
D．The interval between the start-working hours of two places.
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单项选择题
A．Textured like wood.B．Colored like wood.C．Smooth and thin.D．Short and thick.
A．Textured like wood.
B．Colored like wood.
C．Smooth and thin.
D．Short and thick.
单项选择题
A．Two.B．Three.C．Four.D．Five.
A．Two.
B．Three.
C．Four.
D．Five.
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