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135.In communication,a smile is usually ___ strong sign of a friendly and ___ open attitude.
A.the;不填
B.a;an
C.a;不填
D.the;an
136.First impressions are the most lasting.After all,you never get ____ second chance to make ____ first impression.
A.a;the
B.the;the
C.a;a
D.the;a
