6. According to the passage, which of the following is NOT known about the giant squid?
(A) What animals prey upon them.
(B) How common they are.
(C) Where they live.
(D) What they eat.
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統計: A(4), B(17), C(6), D(28), E(0) #820461
統計: A(4), B(17), C(6), D(28), E(0) #820461