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  3. Smoking is harmful to our health and is extremely hazardous to children. Parents who smoke often open a window or turn on a fan

Smoking is harmful to our health and is extremely hazardous to children. Parents who smoke often open a window or turn on a fan

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问题     Smoking is harmful to our health and is extremely hazardous to children. Parents who smoke often open a window or turn on a fan to【B1】______the air for their children, but experts now have【B2】______a related threat to children’s health that isn’t as easy to get rid of: third-hand smoke.
    Doctors from Mass General Hospital for Children in Boston【B3】______the term. It is now being used to describe the【B4】______yet toxic gases and particles that【B5】______to smokers’ hair, clothing and the carpet even after second-hand smoke has been cleaned from a room. The residue (残留物)【B6】______ heavy metals, and even【B7】______materials that young children can get on their hands,【B8】______if they’re crawling or playing on the floor.【B9】______. People agree with the statement that【B10】______. However, far fewer of those surveyed were aware of the risks of third-hand smoke. They believe that when their kids are out of the house, they might smoke【B11】______.
【B4】
选项
答案invisible
解析 修饰关系题。根据句子结构判断，空格处应填入一个形容词与toxic并列，共同修饰gases和particles。结合录音可得答案为invisible，意为“看不见的，隐形的”。
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大学英语四级

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