33. Why does the author mention that “Airplanes retract their landing gear while in flight?”
(A) To show that air resistance and water resistance work differently from each other
(B) To argue that some fishes are better designed than airplanes are
(C) To provide evidence that airplane engineers have studied the design of fish bodies
(D) To demonstrate a similarity in design between certain fishes and airplanes

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統計： A(2), B(2), C(14), D(30), E(0) #569557