推 nemo31:謝謝! 03/08 10:23
※ 引述《nemo31 (shidefan)》之銘言：
: 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?
題目問的是evaluating the result
等於是說，答案要的是針對該實驗發現的狀況提出解釋
如果沒有說明可能的差異原因，那就不是答案
: (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.
依答案內容沒辦法說明rural的greenhouse中植物長的比較快的原因
: (B) At both schools, the plants in the greenhouses grew much more quickly
: than did plants planted outdoors in plots near the greenhouses.
範圍不對->題目沒提到outdoors的部分
: (C) The urban class conducting the experiment was larger than the rural
: class conducting the experiment.
粗看有可能是答案，有說明可能的差異原因
但是如果此選項為真
那無法說明是sulfur dioxide造成，還是因為空間較大造成
(如果題目是問weaken實驗結果，則此答案最佳)
: (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.
可能是答案，因為有說明兩邊差異的可能原因
: (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.
空氣濾清器換的比較快只代表都市空氣比較髒
原題第五行有說在greenhouse內的空氣都是已經去掉sulfur dioxide了
所以此選項為真也無法解釋差異原因
: 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
就結果來看，因為只剩D是可能選項所以選D
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