单项选择题

Questions 29 to 31 are based on the passage you have just heard.

A. 80 million.
B. 70 million.
C. More than 3,500 million.
D. About 3,000 million.

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单项选择题

A. Classmates.
B. Boss and secretary.
C. Husband and wife.
D. Teacher and student.

单项选择题

Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。