44. Which of the following birds are mentioned as those that build nests that include specific color objects?
(A) Ravens
(B) Ospreys
(C) Crows
(D) Sparrow-hawks

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統計： A(7), B(4), C(91), D(4), E(0) #1874603

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#4587658

答案在第三段 

Birds also display remarkable behavior in collecting building materials. Crows have been seen to tear off stout green twigs, and sparrow-hawks will dive purposefully onto a branch until it snaps and then hang upside down to break it off.


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