45. Which of the following statements is true about Wells’s research team?
(A)Their data were collected over two decades.
(B) They recorded the calls of dolphins and birds.
(C) Their major research base was in Mexico.
(D)They trained 250 wild dolphins for observation
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統計: A(50), B(13), C(10), D(11), E(0) #866853
統計: A(50), B(13), C(10), D(11), E(0) #866853