[轉貼]考古題 CR Form24-Q07

[chijer]

考古題 CR Form24-Q07
Tropical forests produce a large percentage of the Earth's supply of oxygen. Continued destruction of these forests is likely to reduce the Earth's oxyen supply to levels that will treaten the existence of all oxygen-department life on Earth.
Which of the follwing, if true, most seriously weakens the preduction above?
A) All of the oxygen produced by the Earth's tropical forests is consumed bybacteria and animals living in those forests.
B) Some of the oxygen produced by the Earth's tropical forests escapes through the upper atmosphere without being consumed.

為什麼答案是a? 我覺得b蠻weaken阿~~

先更正一下你的題目,應該是問weaken the pred"i"ction,對吧?

(A)是指熱帶森林所製造出來的空氣都是被森林裡的細菌及動物所消耗
(B)是指熱帶森林所製造的部分空氣,會在沒經過消耗的情況下,就跑出大氣層再回歸到原敘述所問:
"因為熱帶森林製造了地球上大部分比例的氧氣供應,(故這些對森林的持續破壞 可能造成對地球上賴氧氣維生之生命群的威脅)"

括號內為題目所提及的prediction,(A)選項描述森林所製造之空氣主要為"森林內之細菌及動物所消耗",故減弱了敘述所提及之prediction.