45. What is the passage mainly about?
(A) A special profession.
(B) Shipping and trading.
(C) Guidelines for safe docking.
(D) Protection of the marine environment.
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統計: A(247), B(46), C(34), D(20), E(0) #2160299
統計: A(247), B(46), C(34), D(20), E(0) #2160299