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.
How many refugees came from Vietnam since the early 1970s

A．About 35,000.
B．About 250,000.
C．About 350,000.
D．About 25,000.

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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. How many refugees came from Vietnam since the early 1970s 您的浏览器不支持 audio 元素。