33. The passage mentions all of the following aspects of plankton EXCEPT
(A) the length of their lives
(B) the level of the ocean at which they are found
(C) their movement
(D) their size
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統計: A(1), B(1), C(0), D(0), E(0) #801956
統計: A(1), B(1), C(0), D(0), E(0) #801956