[单项选择]Passage Four
Scientists are closely concerned with the structure of buildings and with the quality of building materials. The World Health Organization(WHO) observes that the introduction of air conditioning and energy conservation measures have been accompanied by growing problems of indoor air quality. Some pollutants arise from insulation products, some from moving cars, and others from modern housing materials. As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important.
Some construction materials, including fiberboard, insulation foams and certain glues for man-made wood floor boards, for example, gives out organic products such as formaldehyde(甲). Heat and humidity increase the release of formaldehyde and the gas seriously harms the eyes. Paint, lacquer, etc. can also release dangerous gas into indoor air.
Construction materials can cause serious damage, especially when they cont
A. Some building materials pollute indoor air.
B. Some factors cause indoor air pollution.
C. Asbestos can cause lung cancer.
D. The land on which houses are built contributes to indoor pollution.

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