27. According to the passage, how do computer-animation companies often test motion?
(A) They experiment with computer-generated line drawings.
(B) They hand-draw successive frames.
(C) They calculate high-resolution images.
(D) They develop extensive mathematical formulas.
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統計: A(75), B(14), C(17), D(14), E(0) #801550
統計: A(75), B(14), C(17), D(14), E(0) #801550