[問題] 一題CR
17. (27669-!-item-!-188;#058&003302)
Urban air contains more sulfur dioxide than does rural air, and plants
in cities typically grow more slowly than do plants in rural areas.
In an experiment to see how much of the difference in growth is due to
sulfur dioxide, classes in an urban and a rural school grew plants in
greenhouses at their schools and filtered the greenhouse air to eliminate
sulfur dioxide. Plants in the urban greenhouse grew more slowly than
those in the rural greenhouse.
Which of the following, if true, would it be most important to take into
account in evaluating the result?
(A) The urban school was located in a part of the city in which levels of
sulfur dioxide in the air were usually far lower than is typical for
urban areas.
(B) At both schools, the plants in the greenhouses grew much more quickly
than did plants planted outdoors in plots near the greenhouses.
(C) The urban class conducting the experiment was larger than the rural
class conducting the experiment.
(D) Heavy vehicular traffic such as is found in cities constantly deposits
grime on greenhouse windows, reducing the amount of light that reaches the
plants inside.
(E) Because of the higher levels of sulfur dioxide in the air at the urban
school, the air filters for the urban school's greenhouse were changed more
frequently than were those at the rural school.
答案是D
本來以為是AE其中之一
希望有人能幫忙解答,謝謝
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