Which statement is true of the description in the first two paragraphs? The sixth paragraph mainly state that the researchers

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问题 Which statement is true of the description in the first two paragraphs?
The sixth paragraph mainly state that the researchers

选项 A、are designing a visual navigational information system.
B、are designing an audio navigational information system.
C、are designing an audio-visual navigational information system.
D、want to determine the best ways of giving navigational information system.

答案D

解析 根据本段第一句可以得知答案。
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