单项选择题

Questions 11 to 13 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. Which one of the following may be best used to describe the flexible system

A．Entirely effective.
B．Totally incorrect.
C．A complete failure.
D．Quite difficult.

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单项选择题

单项选择题

Questions 11 to 13 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. Which one of the following may be best used to describe the flexible system 您的浏览器不支持 audio 元素。