单项选择题

Questions 14 to 16 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 is the distance between the Earth and the two areas of radiation

A．Between 12 and 21 miles.
B．1,000 miles.
C．150 miles.
D．1,500 miles.

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Questions 14 to 16 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 is the distance between the Earth and the two areas of radiation 您的浏览器不支持 audio 元素。