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561.________ economic,political and cultural differences,it is difficult for China and America to fully understand each other.
A.In spite of
B.Regardless of
C.On account of
D.In terms of
562.Although he is often tired _____ his work,he is never tired _____ his job.In fact,he enjoys it.
A.of;with
B.with;from
C.with;of
D.at;with
