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 is the speaker’s field of study

A．Social work.
B．Medical care.
C．Applied physics.
D．Special education.

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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 is the speaker’s field of study 您的浏览器不支持 audio 元素。