166. What does the word "Core" in paragraph 2, line 1 effectively mean?
(A) Essential and mandatory.
(B) Central location.
(C) Middle of the day.
(D) Preliminary.
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統計: A(29), B(0), C(1), D(2), E(0) #3823186
統計: A(29), B(0), C(1), D(2), E(0) #3823186