题目

A recently study found people’s lives are made shorter in North China. It is showed the life expectancy(平均寿命) had been cut down by 5.5 years there. Researchers think that the heavy air pollution in China should be to blame(承担责任). It’s really the truth. Our government has already done something. However, it doesn’t seem to work so well.“Air pollution in China is doing harm to people’s health. The harm is much more serious than we can imagine,” said Chen Yuyu of Beijing University, one of researchers of this study.  Dirty air brings serious problems in North China. I13．What time will the speakers leave home？A．At 7：00．B．At 7：10．C．At 7：30．