According to this passage, the Roman way of communication depended very much upon______. The way of communication ______ made u

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问题 According to this passage, the Roman way of communication depended very much upon______.
The way of communication ______ made use of were visible signs.

选项 A、French
B、Roman
C、African
D、American

答案A

解析 法国工程师发明的用旗语表示拼写字母的方式是可以看到的,所以答案为A。
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