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A．For they are not hard-working.
B．For they don’t have good memories.
C．For they haven’ t enough thne for it.
D．For they are busy with their own language.
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A．There was crystal in all glass.B．Lead crystal makes good glass.C．Crystal is as hard as skyscraper.D．In ordinary glass, the atoms are ordered.
A．There was crystal in all glass.
B．Lead crystal makes good glass.
C．Crystal is as hard as skyscraper.
D．In ordinary glass, the atoms are ordered.
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