单项选择题

Questions l4 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What cause the prices of the telephone system to lower in America

A．The materials became cheaper.
B．There was more competition.
C．More people used the phones.
D．The phones were connected across the sea.

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单项选择题

单项选择题

Questions l4 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What cause the prices of the telephone system to lower in America 您的浏览器不支持 audio 元素。