单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage When did chewing gum become popular in the United States

A．In 1890.
B．In 1819.
C．In 1870.
D．In 1817.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage When did chewing gum become popular in the United States 您的浏览器不支持 audio 元素。