What’s most scary is that there is no safe level of contact with second-hand smoke---even “low-level” exposure can be harmful to one’s health. And “low-level” means when a parent or family member smokes in another room or even outside.

　　While second-hand smoke can be harmful to people of all ages, children face a greater risk than adults: they have smaller lungs; they breathe more quickly; and they have less developed immune(免疫的) systems.

　　Also, young children have little control over their surroundings. Babies can’t move to another room because the air is smoky. They depend on the adults in their lives to make sure that their environments are safe.

　　Recent years have seen second-hand smoke exposure drop---but for adults rather than kids, because policies have been started around the world to ban smoking in public places such as offices, bars and restaurants. However, “Children tend to be exposed to second-hand smoke in homes and cars, and these places are not included in most laws and policies,” Amy Ferketich, a researcher at The Ohio State University, US, told Reuters.

　　So what can we do to limit children’s exposure to second-hand smoke? Parents should stop smoking for good. But if they can’t, they should never smoke---or let others smoke---around their children.

　　53. Which of the following is TRUE according to the article?

　　A. Half of the children ages 9 to 18 in the US have parents who smoked at home.

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