单项选择题

A．Railway workers.
B．A robot.
C．A computer.
D．A machine.
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单项选择题
A．To get materials for a class she missed.B．To discuss an assignment she is working on.C．To ask a question about a video her class recently watched.D．To inform the professor of changes in her schedule.
A．To get materials for a class she missed.
B．To discuss an assignment she is working on.
C．To ask a question about a video her class recently watched.
D．To inform the professor of changes in her schedule.
单项选择题
A．Development of industry.B．Healthy life.C．The future of children.D．Clean air.
A．Development of industry.
B．Healthy life.
C．The future of children.
D．Clean air.
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