单项选择题

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单项选择题
According to this passage, the Roman soldiers mainly depended upon __ to send their messages.
A. fine weather
B. signal towers
C. the spelling system
D. arm movements
单项选择题
Question 23 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news.
Question 23 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question.
Now, listen to the news.
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