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单项选择题
A．Small factories use little oil.B．Small factories have less pollution.C．Small factories need no electricity.D．Small factories are more efficient.
A．Small factories use little oil.
B．Small factories have less pollution.
C．Small factories need no electricity.
D．Small factories are more efficient.
单项选择题
A．Professionals.B．College students.C．Beginners.D．Intermediate learners.
A．Professionals.
B．College students.
C．Beginners.
D．Intermediate learners.
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