单项选择题

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

A．More than six thousand million.
B．More than two thousand million.
C．More than one thousand million.
D．More than three thousand 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。