2. 外语
  3. Homeowners often weatherize their homes, that is, they add insulation and seal up gaps to avoid drafts. In the past, many homeow

Homeowners often weatherize their homes, that is, they add insulation and seal up gaps to avoid drafts. In the past, many homeow

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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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