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. What do you think is the best title for this passage

A．How Is Diamond Formed And Found.
B．Diamond--A Precious Stone.
C．Diamond Hunting.
D．Diamond-Producing Countries.

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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. What do you think is the best title for this passage 您的浏览器不支持 audio 元素。