The study reported on __13__toward smoking in 1,500 households across the United States.It found that the vast majority of both smokers and non-smokers were __14__that second-hand smoke is harmful to children.Some 95 percent of non-smokers and 84 percent of smokers __15__with the statement that “inhaling smoke from a parent’s cigarette can __16__the health of infants and children”．

　　But __17__fewer of those surveyed were aware of the__18__of third-hand smoke.Since the term is so new，the researchers asked people if they agreed with the statement that “breathing air in a room __19__where people smoked yesterday can harm the health of infants and children”．

　　Only 65 percent of non-smokers and 43 percent of smokers agreed with that __20__，which researchers interpreted as acknowledgement of the risks of third-hand smoke.

　　1．A.told

　　B．discussed

　　C．used

　　D．mentioned

　　答案　C

　　解析　联系上下文的语境及日常生活中的常识，我们容易推理出这一句的语境是：所谓“三手烟”是用来指房间内的“二手烟”清除许久之后，仍残留在坐垫、地毯甚至吸烟者头发和衣物上看不见的气体和颗粒的有毒混合物。我们不难看出此处应该填上表示用来之意的动词的过去分词，也即是C项。

　　2．A.shoes

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