逻辑方面-1: 突然觉得关于“有关和无关”的判断,很重要,往往是混淆两项的最终判别方式。 看了题目看了讨论也看了 OG的解释,发现有一个题目很典型。OG紫皮77题,原OG10-175 175. Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae. Which of the following conclusions can properly be drawn from the information above?(归纳题型,不能出现新元素) (A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior. (B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. (无关) (C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. (无关) (D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. (文中无信息此对比) (E) Parasitic wasps use visual clues to calculate the size of a host egg. (无关) 这个题目选项A也许太容易一下子想出来,但是如果从排除法做起,就会容易许多。 题目说,PW把蛋直接下在寄主蛋,数目正好适合寄主的蛋,下多或是下少都不能存活。所以谈到寄主,是对象无关,谈到PW如何具有这种“下适合蛋个数”的能力-experience无关,通过visual无关,下多或者下少谁存活率高也是无关比较。 所以只有A选项,WP寄生的寄主的蛋的个数是可以根据WP下蛋的行为来推测的。 我一开始看这个题目看到“最小值”就觉得不对,而且觉得有点前后颠倒,到底谁决定谁,但是如果用排除法,就发现这个选项是相对好的 。
[此贴子已经被作者于2009-3-14 14:11:30编辑过] |