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.
Mental decay due to aging is ______ .

A．common
B．much more common than most people believe
C．much less common than most people believe
D．true of those over sixty

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单项选择题

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. Mental decay due to aging is ______ . 您的浏览器不支持 audio 元素。