单项选择题

According to this passage, the Roman way of communication depended very much upon______.

A．fine weather
B．high tower
C．the spelling system
D．arm movements
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单项选择题
The way of communication ______ made use of were visible signs.
A．French
B．Roman
C．African
D．American
单项选择题
We can infer (推断) that the plumbing ______ at that time.
A．cost little
B．was more expensive than a water system
C．was too expensive for every family to afford
D．was not necessary
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