Read the passage and choose the best answer among A, B, C, or D. Throughout the United States, the number of places where people are allowed to smoke has gradually ecome smaller and smaller. First, it was banned on trains, buses and plancs, then in public places such as theatres and airports. Now you can’t smoke in any workplace. Nonsmokers are definitely winning the battle. “Why should we breathe their smoke ?”, they say. If they are lucky, smokers can still find some bars and restaurants where ...

Read the passage and choose the best answer among A, B, C, or D.

Throughout the United States, the number of places where people are allowed to smoke has gradually ecome smaller and smaller. First, it was banned on trains, buses and plancs, then in public places such as theatres and airports. Now you can’t smoke in any workplace. Nonsmokers are definitely winning the battle. “Why should we breathe their smoke ?”, they say.

If they are lucky, smokers can still find some bars and restaurants where they can light up a cigarette, but it may soon be banncd there , too. Anti-smoking groups even think that smoking ought to be banned in people’s homes.

Under new plans you won’t be able to smoke where there are more than ten visitors in a week, or where there are children. In 1996, nicotine was classed as drug, like cocaine or heroin. In the country that gave tobacco to the world, smoking might one day be illegal

Question: “ Why should we breathe their smoke?” The word “their” in this sentence means: