单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Cola became a carbonated drink

A．by sheer accident.
B．by careful studying.
C．by complicated experiments.
D．by the clerk’s careless work.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Cola became a carbonated drink 您的浏览器不支持 audio 元素。