31. What is the passage mainly about?
(A) Bluebirds and what they symbolize
(B) What kinds of people like bluebirds
(C) The supernatural power of bluebirds
(D) How positive and negative energies interact
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統計: A(151), B(3), C(6), D(4), E(0) #3235447
統計: A(151), B(3), C(6), D(4), E(0) #3235447