单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．In the second half of the 19th century.
B．In the first half of the 20th century.
C．In the 1960s,
D．In the early 1800s.

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单项选择题

单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。