单项选择题

According to the interview, how many people have been added to the Earth’s population in the past century

A．More than two billion.
B．More than three billion.
C．More than four billion.
D．More than six billion.

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单项选择题

单项选择题

According to the interview, how many people have been added to the Earth’s population in the past century 您的浏览器不支持 audio 元素。