42. Why did the author and Bart Bouricius decide to build a walkway?
(A) To study tropical birds in their natural habitat.
(B) To make canopy research easier and safer for students.
(C) To compete with other universities’ research projects.
(D) To attract tourists to the forests and increase profits.

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統計: A(10), B(162), C(26), D(17), E(0) #3710466

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