单项选择题

A．Machines can do all the physical work for man.
B．Machines can do all the mental work for man.
C．All heavy labor should be replaced by machines.
D．All heavy labor shouldn’t be replaced by machines.
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单项选择题
A．Three weeks.B．One month.C．Three months.D．Over a year.
A．Three weeks.
B．One month.
C．Three months.
D．Over a year.
单项选择题
A．Cotton.B．Coffee.C．Iron.D．Rubber.
A．Cotton.
B．Coffee.
C．Iron.
D．Rubber.
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