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.
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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.
单项选择题
A．Because it happens very fast.B．Because it gives eyes a break.C．Because it moistens eyes.D．Because it relaxes eyes.
A．Because it happens very fast.
B．Because it gives eyes a break.
C．Because it moistens eyes.
D．Because it relaxes eyes.
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