54. What is mentioned as one distinguished feature of krill?
(A) They are the smallest marine animals.
(B) They are food resources for all of marine animals.
(C) They have grasslike nutrients.
(D) They offer as much as food energy as shrimps do.
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統計: A(4), B(5), C(9), D(45), E(0) #3440844
統計: A(4), B(5), C(9), D(45), E(0) #3440844