单项选择题

Questions 22 and 23 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now, listen to the news. How many old people have been examined for the research

A．815.
B．855.
C．831.
D．865.

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单项选择题

单项选择题

Questions 22 and 23 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now, listen to the news. How many old people have been examined for the research 您的浏览器不支持 audio 元素。