33 According to the passage, why do birds frequently fly for a long distance?
(A) They like to fly.
(B) They are migrating.
(C) They are looking for food.
(D) They are looking for companions.

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統計: A(0), B(32), C(75), D(7), E(0) #1198826

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文章第一段 ~Many large bi...
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