2.
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 (保护) measures have been accompanied by
growing problems of indoor air quality. Some pollutants
arise from insulation (隔音) 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, give out organic products such as formaldehyde (甲醛). 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 contain asbestos(石棉). Asbestos is naturally present in rock formations worldwide. It belongs to a family of mineral substances made up of solid,
non-combustible(非易燃品) fiber.
These properties make asbestos a highly sought-after construction material. As early as 1931, however, public health officers in the United
Kingdom revealed the connection between breathing in asbestos dust and such
diseases as lung cancer.
The land on which a building is sited
may also contribute to pollution. Some kinds of granite
or similar rocks contain traces of radium. As it breaks
down, this naturally radioactive element produces some kind of radioactive gas
that goes through tiny cracks in walls, floors and building materials, and
makes its way into the building and the rooms. The
better the homes are insulated, the more is the dangerous gas in indoor air. The main effect of this dangerous gas on health is to increase the
risk of lung cancer.
1.What is the main idea of
the passage?
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.
2.Why are Europeans
particularly concerned with building materials?
A.Lots
of building materials there are radioactive.
B.They
stay home up to 90% of their lives.
C.They
have a high rate of lung cancer.
D.They
spend most of their time indoors.
3.Why is asbestos a sought-after
building material?
A.It
is a kind of insulation foam.
B.Asbestos
will not give out dangerous gas.
C.This
material is not easy to catch fire.
D.It
is rarely present in rock formations.
4.Why should we be careful
about the land on which a building is to be sited?
A.To
determine whether the land is firm enough for a building to be sited on.
B.To
make sure that the land contains no radioactive material.
C.To
make certain that the land releases no formaldehyde or other gases.
D.To
check whether it contains any combustible materials.