Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species. Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates. Clearly, dropping this restriction would allow the other species to recover.(你不知道他要解禁的是時間上的管制,還是數量上的管制,請不要胡思亂想)
Which of the following, if true, most seriously undermines the argument? = 解禁對數量管制是無效的 本題有兩個Factors:"時間"和"數量" B.很多年以來獵季都比預估的提早結束=提早獵到預估的規定數量=族群的量超出預估=若規定是對管制數量有效的,族群數量應下降, 而題目中卻說近年數量是上升的, 表示管制是無效的 = weaken (答案中有暗示數量與時間兩個因子) It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date. C.每年被獵的量都上升=族群的5%上升=族群上實質的量上升(但是你不知道上升多少,一隻也是多兩隻也是多) 且提到的因僅有"數量"沒有"時間", 的確可以反駁禁令對管制量有效,但是比起B的weaken來的薄弱 The number of snow geese taken by hunters each year has grown every year for several years. D.數量上升改棲地, "若有人想獵人會找不到, 就是犯了自行衍伸思考的毛病" As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
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发表于 2006-8-26 20:53:00
