A、Over five million. B、Over eight mill ion. C、One billion. D、One million. C细节题。短文开头处，报告中称，到本世纪末，因烟草使用而死亡的人数将达到10亿，故答案为C)。

A World Health Organization report says tobacco now causes more than five million deaths a year. It predicts this number will rise to more than eight million by the year 2030.[22]By the end of the century, it says, tobacco could kill one billion people — ten times as many as in the 20th century.
    The large majority of these deaths will take place in developing countries.[23]More than 25 percent of all smokers in the world are Chinese. India, Indonesia, Russia and the United States, in that order, follow China in tobacco use.
    The World Health Organization is urging countries to follow six policies to prevent millions of deaths linked to tobacco use. The six policies are known as MPOWER, spelled M-P-O-W-E-R.
    The letter M means monitoring tobacco use and prevention policies. The P is for protecting people by establishing smoke-free areas.[24]O is for offering services to help people stop smoking. The letter W means warning people about the dangers of tobacco. E is for enforcing bans on tobacco advertising and other forms of marketing. And R is for raising taxes on tobacco.
     [25]The report says raising taxes is the single most effective way to reduce tobacco use. A study found that governments now collect an average of five hundred times more money in tobacco taxes each year than they spend on control efforts.
22. How many people will be killed due to tobacco use by the end of the century?
23. Which of the following is the right order of smoker numbers in tobacco use?
24. What does the letter O in MPOWER mean?
25. What is the most effective way to reduce tobacco use?