单项选择题

Questions 22 to 25 are based on the passage you have just heard.

A. Because the horse and wagon were slow.
B. Because the trains were too fast.
C. Because some towns were far away.
D. Because the communities didn’t like it.

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单项选择题

A. To fly through the water looking for explorers.B. To show TV programs and films to experimental workers at sea.C. To demonstrate technology for the development of another vehicle of its kind.D. To transport explorers to the very bottom of the sea.

A. To fly through the water looking for explorers.
B. To show TV programs and films to experimental workers at sea.
C. To demonstrate technology for the development of another vehicle of its kind.
D. To transport explorers to the very bottom of the sea.

Questions 22 to 25 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 22 to 25 are based on the passage you have just heard.