单项选择题

Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. Humans can distinguish about ______.

A．10,000 different odors
B．10 different odors
C．1,000 different odors
D．100 different odors

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Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. Humans can distinguish about ______. 您的浏览器不支持 audio 元素。