Section A Directions:In this
section, there is a passage with ten blanks. You are required to select one word
for each blank from a list of choices given in a word bank following the
passage. Read the passage through carefully before making your choices. Each
choice in the bank is identified by a letter.
Most people are aware that outdoor air pollution can damage
their health, but many do not know that indoor air pollution can also have
significant health effects. Environmental Protection Agency studies indicate
that indoor levels of pollutants may be 2-5 times, and (47)
more than 100 times, higher than outdoor levels. These levels of indoor air
pollutants may be of particular concern because most people spend about 90% of
their time (48) . There are many sources of
indoor air pollution in any home. These include combustion sources such as oil,
gas, coal, wood, and tobacco products; building materials and furnishings as
(49) as deteriorated (变坏的) asbestos-containing (含有石棉成分的)
insulation (绝缘材料), wet or damp carpet, and cabinetry or furniture made of
certain pressed (50) products; products for household
cleaning and maintenance, personal care, or hobbies; central heating and cooling
(51) and humidification devices; and outdoor sources such as
radon (氡), pesticides, and outdoor air pollution. Immediate
effects may show up after a single exposure or (52)
exposures. These include irritation (刺激，过敏) of the eyes, nose, and throat,
headaches, dizziness, and (53) . Such immediate effects are
usually short-term and treatable. Sometimes the treatment is simply
(54) the person’s exposure to the source of the pollution,
if it can be identified. The likelihood of immediate reactions
to indoor air pollutants depends on several factors. Age and pre-existing
medical conditions are two important influences. In other cases, whether a
person (55) to a pollutant depends on individual
sensitivity, which (56) tremendously from person to
person. A) reacts
F) systems
K)
plastic B) diverse
G) immediately
L) eliminating
C) identical
H) wood
M) occasionally D)
fatigue
I) varies
N) repeated E) reducing
J)
indoors
O) includes