【GWD逻辑争议题汇总】边做边贴，欢迎补充、讨论。

Polka · 发表于 2010-7-27 16:07:23

34. GWD17-Q34:
During the month of May, crabs arrive on Delaware's beaches to lay eggs.Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.Delaware’s crab population has declined recently.This decline, however, poses no serious threat to the migrating shorebird populations: by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.
Which of the following, if true, most seriously weakens the argument?

A.No other food available to the birds on Delaware's beaches is as nutritious and accessible as are crab eggs.
B.The decline in the number of crabs on Delaware's beaches is due to the harvesting of crabs by humans.
C.There are more crabs on Delaware's beaches than in any other area that the migrating birds pass through.
D.The crabs do not conceal their eggs.
E.The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.

Polka · 发表于 2010-7-27 16:12:03

4. GWD21-Q4:
Which of the following most logically completes the passage?
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______.
A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
C. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis

做题要点：CR题最主要的还是理解题意，找到logic flow的漏洞或是缺陷在哪里。
题意：阑尾炎的解决方案就是手术切除。虽然风险很低，但是有20%的手术并没有必要。新的内窥镜技术能够准确诊断是否需要手术，98%诊断正确，另有2%诊断错误。因而使用这项技术可以大量减少不必要的手术而不减少必要手术。
B项：新测试的误诊都是将没病当成有病。则有病的病人不会被诊断为没病。这样符合原句的结论，不减少必要的手术。

Polka · 发表于 2010-7-27 16:13:48

30. GWD21-Q30:
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was ten years ago.
Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?
A. A few children still use traditional wooden sleds.
B. Very few children wear any kind of protective gear, such as helmets, while sledding.
C.

lastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
D. Most sledding injuries occur when a sled collides with a tree, a rock, or, another sled.
E. Because the traditional wooden sled can carry more than one rider, an accident involving a wooden sled can result in several children being injured.

题意：过去，V地的孩子们都用木雪橇滑雪。十年前，塑料雪橇开始流行。塑料雪橇比木雪橇滑的快，但同时也更加难以控制和减速。去年，在滑雪中受伤的孩子数量明显高于十年前在滑雪中受伤的孩子数量，这一事实明确说明了塑料雪橇比木雪橇要危险。以下哪一选项削弱作者的上述引证？
A很少有孩子仍然使用木雪橇。
B很少有孩子在滑雪时使用保护装置。
C 塑料雪橇可以在更多的雪地状态下使用。
D大多数滑雪受伤发生于雪橇与其他物体的碰撞。
E因为木雪橇可以同时载更多的孩子，因而一次事故可引起多人受伤。

C项，Plastic sled用的范围广，因此小孩受伤的概率也大；如果和木头的板在同等条件下使用，受伤的概率就可能不会比木头的大，削弱。
这道题的矛盾主体是Plastic sleds，所以答案中应包含对Plastic sleds的解释，因此只能选C。E选项说的是wooden sled，与题中问你的为什么plastic sleds导致受伤增多无关，而且E选项本来就是错的，E的意思是wooden sled的缺点，说明wooden sled 产生了更多的injuries，与题目矛盾。

【GWD逻辑争议题汇总】边做边贴，欢迎补充、讨论。

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