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Questions 26 to 28 are based on the passage you have just heard.

A．How Diamond is Formed and Found.
B．Diamond-A Precious Stone.
C．Diamond Hunting.
D．Diamond--Producing Countries.

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Before their son was born, the spouse could see each other______.

Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。