13. snakes: hiss= __________________
(A) bears: quack
(B) ducks: croak
(C) frogs: roar
(D) cats: purr
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統計: A(7), B(36), C(3), D(53), E(0) #1828537
統計: A(7), B(36), C(3), D(53), E(0) #1828537