9. Astronauts who experience weightlessness frequently get motion sickness. The astronauts see their own motion relative to passing objects, but while the astronauts are weightless their inner ears indicate that their bodies are not moving. The astronauts’ experience is best explained by the hypothesis that conflicting information received by the brain about the body’s motion causes motion sickness. Which one of the following, if true, provides the strongest additional support for the hypothesis above? (A) During rough voyages ship passengers in cabins providing a view of the water are less likely to get motion sickness than are passengers in cabins providing no view. (B) Many people who are experienced airplane passengers occasionally get motion sickness. (C) Some automobile passengers whose inner ears indicate that they are moving and who have a clear view of the objects they are passing get motion sickness. (D) People who have aisle seats in trains or airplanes are as likely to get motion sickness as are people who have window seats. (E) Some astronauts do not get motion sickness even after being in orbit for several days. 为什么A对那，乘客看到了移动的水应该比没看到的更容易MOTION SICKNESS呀，A 是反对呀？我认为应该是B
15. Dental researcher: Filling a cavity in a tooth is not a harmless procedure: it inevitably damages some of the healthy parts of the tooth. Cavities are harmful only if the decay reaches the nerves inside the tooth, and many cavities, if left untreated, never progress to that point. Therefore, dentists should not fill a cavity unless the nerves inside the tooth are in imminent danger from that cavity. Which one of the following principles, if valid, most strongly supports the researcher’s reasoning? (A) Dentists should perform any procedure that is likely to be beneficial in the long term, but only if the procedure does not cause immediate damage. (B) Dentists should help their patients to prevent cavities rather than waiting until cavities are present to begin treatment. (C) A condition that is only potentially harmful should not be treated using a method that is definitely harmful. (D) A condition that is typically progressive should not be treated using methods that provide only temporary relief. (E) A condition that is potentially harmful should not be left untreated unless it can be kept under constant surveillance. 这到题是否要用逆否等关系来推那，ONLY IF，UNLESS一多我就晕了。
刚看了CXD的逻辑，试将15题分析如下：此句的结论是最后一句，THEREFORE--- 根据支持支持结论，首先看它。 Therefore,dentists should not fill a cavity unless the nerves inside the tooth are in imminent danger from that cavity. fill a cavity->nerves inside the tooth are in dander 它的逆否命题为： tooth not danger->not fill a cavity 这样不就得到选项C了么？不知对不对，请大侠指教
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发表于 2003-10-5 10:52:00
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