单项选择题

Rubber differs from plastics_________ it is produced naturally and not in file.

A．at that
B．in that
C．for that
D．with that
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单项选择题
_____you’’ re early you can’’t be sure of getting a seat.
A．If
B．Unless
C．When
D．Because
单项选择题
Evidence came up_________ specific speech sounds are recognized by babies as young as 6 months old.
A．where
B．that
C．which
D．what
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