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 does the expression the "age of the iron horse" refer to

A．The era during which the railroads was the dominant mode of transportation.
B．The time during which mail was delivered by horse.
C．The point at which airmail began to constitute the bulk of United States mail.
D．The time period covered in the museum exhibition.

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单项选择题

Which of the following is not mentioned in the talk

A．The early Indians cooked their food by burying it under the hot sand.
B．Raw food has been eaten for thousands of years.
C．The earlier kitchen utensil was very simple.
D．Boiling food became possible after fire-proof containers appeared.

单项选择题

According to the author, which of the following people usually lead a new fashion

A．Philosophers.
B．Artists.
C．Writers.
D．The social elite.

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What does the expression the "age of the iron horse" refer to 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 does the expression the "age of the iron horse" refer to