48. Which of the following is NOT mentioned in the passage as a form of passport?
(A) A letter.
(B) A receipt.
(C) A proof of identity.
(D) A list of seaports.
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統計: A(20), B(36), C(56), D(131), E(0) #2611707
統計: A(20), B(36), C(56), D(131), E(0) #2611707