A. Because people were unable to understand signs, signals, and symbols.
B. Because people wanted to communicate across long distances.
C. Because people believed that signs, signals, and symbols were obsolete.
D. Because people wanted new forms of communication.
Đáp án là B
Ý trong bài: As a result, means of communication intended to be used for long distances and extended periods are based upon speech. Radio, television, and the telephone are only a few.
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