6. Whales, dolphins, porpoises, seals, walruses, and many other marine animals are _______, not fish.
(A)bonus
(B)mammals
(C)advertisers
(D)flakes

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統計： A(0), B(1), C(0), D(0), E(0) #3853816

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答案：(B) mammals /ˈmæm...
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