单项选择题

Questions 18 to 20 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.
What does the speaker say the term stadium refers to

A．A place for making astronomical observations.
B．An instrument used for observing stars.
C．A unit of measurement.
D．The North Star.

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单项选择题

单项选择题

Questions 18 to 20 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. What does the speaker say the term stadium refers to 您的浏览器不支持 audio 元素。