Some cleaning fluids, synthetic carpets, wall paneling, and other products release toxins, such as formaldehyde and benzene, into the household air supply. This is not a problem in well-ventilated houses, but it is a problem in houses that are so well insulated that they trap toxins as well as heat. Recent tests, however, demonstrate that houseplants remove some household toxins from the air and thereby eliminate their danger. In one test, 20 large plants eliminated formaldehyde from a small, well-insulated house.
84. The passage is structured to lead to which one of the following conclusions?
(A) Houseplants can remove benzene from the air.
(B) Nonsynthetic products do not release toxins into houses.
(C) Keeping houseplants is an effective means of trapping heat in a poorly insulated house.
(D) Keeping houseplants can compensate for some of the negative effects of poor ventilation.
(E) The air in a well-insulated house with houseplants will contain fewer toxins than the air in a well-ventilated house without houseplants.
E的核心错误就是根据高中生物学的控制变量法判断得出的。只能比较有houseplants的well-insulated house和有houseplant的well-ventilated house，而不能比较有houseplants的well-insulated house和没有houseplant的well-ventilated house
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发表于 2009-8-27 00:14:00
