How does the top-down approach differ from the bottom-up approach in language processing？
A．Bottom-up processing is more effective than top-down processing in speech synthesis.
B．Bottom-up processing utilizes all information one has in speech perception.
C．Top-down processing uses one" s existing knowledge and the incoming speech signal.
D．Top-down processing is more efficient than bottom-up processing in speech comprehension.
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此题为判断题（对，错)。
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