单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. Modern industry must have developed ______

A．before the Middle Ages
B．around the 19th century
C．in Greece or Rome
D．machines to take tests

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. Modern industry must have developed ______ 您的浏览器不支持 audio 元素。