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  3. Parents who smoke often open a window or turn on a fan to clear the air for their children, but experts now have identified a r

Parents who smoke often open a window or turn on a fan to clear the air for their children, but experts now have identified a r

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问题     Parents who smoke often open a window or turn on a fan to
clear the air for their children, but experts now have identified a
relative threat to children’s health that isn’t as easy to get rid of:【M1】______
third-hand smoke. That’s the term being used to describe the
invisible yet toxic mixture of gas and particles clinging to【M2】______
smokers’ hair and clothing, not mention cushions and carpeting,【M3】______
that linger long after second-hand smoke has cleared from a room.【M4】______
The reminder includes heavy metals and radioactive materials that【M5】______
young children can get on their hands and ingest, especially if
they’re crawling or playing on the floor.
    Doctors from MassGeneral Hospital for Children in Boston
coined the term "third-hand smoke" to describe these chemicals in
a new study that focused on the risks they pose to infants and
children. The study was published in latest issue of the journal【M6】______
Pediatrics. "Everyone knows that second-hand smoke is bad, but
they don’t know about this," said Dr. Jonathan P. Winickoff, the
leaded author of the study and an assistant professor of【M7】______
pediatrics at Harvard Medical School. "When your kids are out of【M8】______
the house, they might smoke. Or they smoke in the car. Or they
strap the kid in the car seat in the back and crack the window and
smoke, and they think it’s okay so the second-hand smoke isn’t【M9】______
getting to their kids," Dr. Winickoff continued. "We needed a term
to describe these tobacco toxins that aren’t invisible."【M10】______
【M8】
选项
答案your一their
解析 语法错误。全文从未使用第二人称进行表述，从下文they might smoke可知，此处的小孩也是指那些抽烟者的小孩，故将物主代词改为their。
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