单项选择题

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

A．About 45 million.
B．About 5.4 million.
C．About 50 million.
D．About 4.5 million.

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单项选择题

单项选择题

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