单项选择题

A．8. 5 hours.
B．7. 5 hours.
C．8 hours.
D．9 hours.
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单项选择题
A．Pick out all the glass and metal.B．Get rid of dust.C．Bum waste paper.D．Screen earth and sand.
A．Pick out all the glass and metal.
B．Get rid of dust.
C．Bum waste paper.
D．Screen earth and sand.
单项选择题
A．In the early 1900’’s.B．In the mid-1800’’s.C．In the early 1800’’s.D．In the late 1800’’s.
A．In the early 1900’’s.
B．In the mid-1800’’s.
C．In the early 1800’’s.
D．In the late 1800’’s.
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