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. What does the passage mainly tell us

A．Invention of chewing gum.
B．Chewing gum’s contribution to people’s health.
C．How Wrigley made chewing gum popular in the U.S.
D．Chewing gum--a great favorite with the American people.

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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. What does the passage mainly tell us 您的浏览器不支持 audio 元素。

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. What does the passage mainly tell us