单项选择题

Questions 28 to 30 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
How many countries is lack of health workers

A．57.
B．36.
C．21.
D．Unclear.

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单项选择题

单项选择题

Questions 28 to 30 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. How many countries is lack of health workers 您的浏览器不支持 audio 元素。