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  3. Homeowners often weatherize their homes, that is, they add insulation and se

Homeowners often weatherize their homes, that is, they add insulation and se

游客2025-02-19  49
问题     Homeowners often weatherize their homes, that is, they add insulation and seal up gaps to avoid drafts. In the past, many homeowners used insulation that releases formaldehyde, a gas that at high concentrations causes health problems. Such insulation is now banned. It is still possible, however, to create dangerous levels of formaldehyde by weatherizing a house, since reducing airflow increases the concentrations of any gas being released into the air of the house, and________.
    Which of the following most logically completes the argument?
选项 A、any formaldehyde-releasing insulation installed before the ban has long since stopped releasing formaldehyde
B、many items in a typical home release measurable quantities of formaldehyde
C、the insulation that releases formaldehyde was easy to install in an existing house
D、almost all of the fresh air that enters a weatherized house enters through heating and cooling vents
E、certain other kinds of insulation present other health risks if not used properly
答案 B
解析 即使隔热物释放的甲醛不存在了，但是其他东西依然会释放甲醛，加上原文提到的减少空气流动会导致气体浓度升高，可知该项能够解释文章，B正确。A项隔热物早就停止释放甲醛，无法解释为什么现在的甲醛浓度依然有可能升高。C项和是否容易安装无关，不选。D项新鲜空气来自哪里，和本文讨论内容无关，不选。E项文中只是讨论甲醛，和其他健康问题无关，不选。
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