单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
What is the talk mainly about

A．Overland transportation in the nineteenth century.
B．Historical aspects of mail delivery.
C．Vehicles currently in use by the postal service.
D．The invention of railroad.

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单项选择题

In which way may the first cooked food be made

A．It was accidentally baked on volcanoes.
B．It was cooked by forest fire by chance.
C．It was boiled in the natural hot-water spring.
D．It was cooked by the heat of the sun.

填空题

William Waldo established ______ .

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What is the talk mainly about 您的浏览器不支持 audio 元素。

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
What is the talk mainly about