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.
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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.
单项选择题
A．Teach Brain’s class while he’s absent.B．Give Prof. Smith the key to Brain’s office.C．Leave a message on the board in Brain’s office.D．Bring Brain the homework that was due today.
A．Teach Brain’s class while he’s absent.
B．Give Prof. Smith the key to Brain’s office.
C．Leave a message on the board in Brain’s office.
D．Bring Brain the homework that was due today.
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