【单选题】

{{B}}Passage OneQuestions 26 to 28 are based on the passage you have just hearD、{{/B}}

A、They promised there would be one thousand million people without safe drinking water by 2015.
B．They promised there would be one hundred million people without safe drinking water by 2015.
C．They promised there would be only five hundred million people without safe systems to treat waste by 2015.
D．They promised there would be only one thousand million people without safe systems to treat waste by 2015.