单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What percentage of the third-class children survived

A．1/2.
B．1/4.
C．1/3.
D．2/3.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What percentage of the third-class children survived 您的浏览器不支持 audio 元素。