authorities on Tuesday preserved an orange alert(警报)一the city’s second highest pollution-warning

　　level—and again warned people to stay indoors．Experts widely agree that small particulates(颗粒)

　　known as PM2.5 carry significant short-and long-term health risks，particularly with children．Other

　　studies find a certain link between pollution and shorter life spans。

　　Chinese state media have noted a rise in cancer levels in Beijing,without specifying(具体说明)

　　whether the new cases are the main result of pollution,smoking,other sources or some combination．

　　Bernhard Schwartlander，the organization’s China chief，said he is concerned and has been in

　　contact with national authorities．“There is no easy solution,”Dr. Schwartlainder said，adding that

　　solving the problem requires managing industry and the economy．WHO leaders advised citizens．to

　　stay indoors and limit exposure to the harmful particulates．When asked if wearing a face mask has

　　any proven efficacy in preventing health effects of air pollution，Dr. Schwartlainder said，“Whatever

　　you do，it’s better than nothing.”

　　1．We can learn from the passage that

　　.

　　A．in case of an orange alert, we had better not go outside

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